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Howmet Aerospace Inc. – ‘10-K’ for 12/31/23 – ‘EX-101.SCH’

On:  Tuesday, 2/13/24, at 5:05pm ET   ·   For:  12/31/23   ·   Accession #:  4281-24-7   ·   File #:  1-03610

Previous ‘10-K’:  ‘10-K’ on 2/14/23 for 12/31/22   ·   Latest ‘10-K’:  This Filing   ·   44 References:   

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  As Of               Filer                 Filing    For·On·As Docs:Size

 2/13/24  Howmet Aerospace Inc.             10-K       12/31/23  145:18M

Annual Report   —   Form 10-K   —   SEA’34

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   2.80M 
 2: EX-10.(B)   Material Contract                                   HTML    681K 
 3: EX-10.(C)   Material Contract                                   HTML    668K 
 9: EX-10.(DD)  Material Contract                                   HTML     76K 
 4: EX-10.(F)(3)  Material Contract                                 HTML     44K 
 5: EX-10.(F)(4)  Material Contract                                 HTML     58K 
 6: EX-10.(G)(2)  Material Contract                                 HTML     45K 
10: EX-10.(GG)  Material Contract                                   HTML     84K 
11: EX-10.(HH)  Material Contract                                   HTML    139K 
 7: EX-10.(M)   Material Contract                                   HTML    177K 
 8: EX-10.(M)(1)  Material Contract                                 HTML     38K 
12: EX-10.(SS)  Material Contract                                   HTML    195K 
13: EX-10.(TT)  Material Contract                                   HTML    190K 
14: EX-21       Subsidiaries List                                   HTML     41K 
15: EX-23       Consent of Expert or Counsel                        HTML     37K 
16: EX-24       Power of Attorney                                   HTML     46K 
19: EX-97       Clawback Policy re: Recovery of Erroneously         HTML     60K 
                Awarded Compensation                                             
17: EX-31       Certification -- §302 - SOA'02                      HTML     46K 
18: EX-32       Certification -- §906 - SOA'02                      HTML     40K 
25: R1          Cover Page                                          HTML    109K 
26: R2          Audit Information                                   HTML     43K 
27: R3          Statement of Consolidated Operations                HTML    121K 
28: R4          Statement of Consolidated Comprehensive Income      HTML     67K 
29: R5          Consolidated Balance Sheet                          HTML    150K 
30: R6          Consolidated Balance Sheet (Parenthetical)          HTML     40K 
31: R7          Statement of Consolidated Cash Flows                HTML    142K 
32: R8          Statement of Changes in Consolidated Equity         HTML     88K 
33: R9          Statement of Changes in Consolidated Equity         HTML     41K 
                (Parenthetical)                                                  
34: R10         Summary of Significant Accounting Policies          HTML     80K 
35: R11         Recently Adopted and Recently Issued Accounting     HTML     54K 
                Guidance                                                         
36: R12         Segment and Geographic Area Information             HTML    258K 
37: R13         Restructuring and Other Charges                     HTML     90K 
38: R14         Interest Cost Components                            HTML     48K 
39: R15         Other Expense, Net                                  HTML     56K 
40: R16         Pension and Other Postretirement Benefits           HTML    289K 
41: R17         Income Taxes                                        HTML    169K 
42: R18         Preferred and Common Stock                          HTML    109K 
43: R19         Earnings Per Share                                  HTML     56K 
44: R20         Accumulated Other Comprehensive Loss                HTML    101K 
45: R21         Receivables                                         HTML     50K 
46: R22         Inventories                                         HTML     47K 
47: R23         Properties, Plants, and Equipment, Net              HTML     51K 
48: R24         Goodwill and Other Intangible Assets                HTML    100K 
49: R25         Leases                                              HTML     63K 
50: R26         Debt                                                HTML     81K 
51: R27         Other Financial Instruments                         HTML     50K 
52: R28         Cash Flow Information                               HTML     47K 
53: R29         Divestitures                                        HTML     41K 
54: R30         Contingencies and Commitments                       HTML     70K 
55: R31         Subsequent Events                                   HTML     40K 
56: R32         Pay vs Performance Disclosure                       HTML     50K 
57: R33         Insider Trading Arrangements                        HTML     44K 
58: R34         Summary of Significant Accounting Policies          HTML    130K 
                (Policies)                                                       
59: R35         Summary of Significant Accounting Policies          HTML     61K 
                (Tables)                                                         
60: R36         Segment and Geographic Area Information (Tables)    HTML    263K 
61: R37         Restructuring and Other Charges (Tables)            HTML     86K 
62: R38         Interest Cost Components (Tables)                   HTML     48K 
63: R39         Other Expense, Net (Tables)                         HTML     56K 
64: R40         Pension and Other Postretirement Benefits (Tables)  HTML    282K 
65: R41         Income Taxes (Tables)                               HTML    172K 
66: R42         Preferred and Common Stock (Tables)                 HTML    100K 
67: R43         Earnings Per Share (Tables)                         HTML     54K 
68: R44         Accumulated Other Comprehensive Loss (Tables)       HTML    100K 
69: R45         Inventories (Tables)                                HTML     47K 
70: R46         Properties, Plants, and Equipment, Net (Tables)     HTML     54K 
71: R47         Goodwill and Other Intangible Assets (Tables)       HTML    103K 
72: R48         Leases (Tables)                                     HTML     72K 
73: R49         Debt (Tables)                                       HTML     56K 
74: R50         Other Financial Instruments (Tables)                HTML     45K 
75: R51         Cash Flow Information (Tables)                      HTML     52K 
76: R52         Summary of Significant Accounting Policies -        HTML     58K 
                Narrative (Details)                                              
77: R53         Summary of Significant Accounting Policies -        HTML     54K 
                Weighted-average Useful Lives of Structures and                  
                Machinery and Equipment (Details)                                
78: R54         Summary of Significant Accounting Policies -        HTML     54K 
                Weighted-average Useful Lives of Software and                    
                Other Intangible Assets (Details)                                
79: R55         Segment and Geographic Area Information -           HTML     52K 
                Narrative (Details)                                              
80: R56         Segment and Geographic Area Information - Schedule  HTML     95K 
                of Operating Results of Arconic's Reportable                     
                Segment (Details)                                                
81: R57         Segment and Geographic Area Information - Schedule  HTML     45K 
                of Capital Expenditure (Details)                                 
82: R58         Segment and Geographic Area Information - Schedule  HTML     48K 
                of Reconciliation of Certain Segment Information                 
                to Consolidated Totals (Details)                                 
83: R59         Segment and Geographic Area Information - Schedule  HTML     62K 
                of Segment Operating Profit to Consolidated Net                  
                Income (loss) Income Attributable to Arconic                     
                (Details)                                                        
84: R60         Segment and Geographic Area Information - Schedule  HTML     73K 
                of Segment Reporting Information to Consolidated                 
                Assets (Details)                                                 
85: R61         Segment and Geographic Area Information - Schedule  HTML     67K 
                of Geographic Information for Sales (Details)                    
86: R62         Segment and Geographic Area Information - Schedule  HTML     56K 
                of Geographic Information for Long-lived Assets                  
                (Details)                                                        
87: R63         Segment and Geographic Area Information - Schedule  HTML     82K 
                of Disaggregation of Revenue by Major End Market                 
                Served (Details)                                                 
88: R64         Restructuring and Other Charges - Schedule of       HTML     53K 
                Restructuring and Other Charges (Details)                        
89: R65         Restructuring and Other Charges - Narrative         HTML     94K 
                (Details)                                                        
90: R66         Restructuring and Other Charges - Schedule of       HTML     75K 
                Restructuring and Other Charges by Reportable                    
                Segments, Pretax (Details)                                       
91: R67         Interest Cost Components (Details)                  HTML     47K 
92: R68         Other Expense, Net - Schedule of Other Expense,     HTML     55K 
                Net (Details)                                                    
93: R69         Other Expense, Net - Narrative (Details)            HTML     45K 
94: R70         Pension and Other Postretirement Benefits -         HTML    105K 
                Narrative (Details)                                              
95: R71         Pension and Other Postretirement Benefits -         HTML    143K 
                Schedule of Obligations and Funded Status                        
                (Details)                                                        
96: R72         Pension and Other Postretirement Benefits -         HTML     58K 
                Schedule of Pension Plan Benefit Obligations                     
                (Details)                                                        
97: R73         Pension and Other Postretirement Benefits -         HTML     76K 
                Schedule of Components of Net Periodic Benefit                   
                Cost (Details)                                                   
98: R74         Pension and Other Postretirement Benefits -         HTML     54K 
                Schedule of Weighted Average Assumptions Used to                 
                Determine Benefit Obligations (Details)                          
99: R75         Pension and Other Postretirement Benefits -         HTML     42K 
                Schedule of Assumed Health Care Cost Trend Rates                 
                (Details)                                                        
100: R76         Pension and Other Postretirement Benefits -         HTML     50K  
                Schedule of Pension and Postretirement Plans                     
                Investment Policy and Weighted Average Asset                     
                Allocations (Details)                                            
101: R77         Pension and Other Postretirement Benefits -         HTML    125K  
                Schedule of Fair Value of Pension Plan Assets                    
                (Details)                                                        
102: R78         Pension and Other Postretirement Benefits -         HTML     57K  
                Schedule of Funding and Cash Flows and Defined                   
                Contribution Plans (Details)                                     
103: R79         Income Taxes - Schedule of Components of Income     HTML     48K  
                from Continuing Operations Before Income Taxes                   
                (Details)                                                        
104: R80         Income Taxes - Schedule of Provision for Income     HTML     66K  
                Taxes on Income from Continuing Operations                       
                (Details)                                                        
105: R81         Income Taxes - Schedule of Reconciliation of U.S.   HTML     78K  
                Federal Statutory Rate to Effective Tax Rate                     
                (Details)                                                        
106: R82         Income Taxes - Schedule of Components of Net        HTML     80K  
                Deferred Tax Assets and Liabilities (Details)                    
107: R83         Income Taxes - Schedule of Expiration Periods of    HTML     65K  
                Deferred Tax Assets (Details)                                    
108: R84         Income Taxes - Narrative (Details)                  HTML     75K  
109: R85         Income Taxes - Schedule of Changes in Valuation     HTML     50K  
                Allowance (Details)                                              
110: R86         Income Taxes - Schedule of Reconciliation of        HTML     45K  
                Unrecognized Tax Benefits (Excluding Interest and                
                Penalties) (Details)                                             
111: R87         Preferred and Common Stock - Narrative (Details)    HTML    167K  
112: R88         Preferred and Common Stock - Schedule of Share      HTML     50K  
                Activity (Details)                                               
113: R89         Preferred and Common Stock - Schedule of Details    HTML     50K  
                For the Share Repurchases (Details)                              
114: R90         Preferred and Common Stock - Schedule of Activity   HTML    103K  
                for Stock Options and Stock Awards (Details)                     
115: R91         Earnings Per Share and Common Stock -               HTML     73K  
                Reconciliation of Information Used to Compute                    
                Basic and Diluted EPS (Details)                                  
116: R92         Earnings Per Share - Narrative (Details)            HTML     55K  
117: R93         Accumulated Other Comprehensive Loss (Details)      HTML     81K  
118: R94         Receivables (Details)                               HTML     53K  
119: R95         Inventories - Schedule of Inventory Components      HTML     50K  
                (Details)                                                        
120: R96         Inventories - Narrative (Details)                   HTML     44K  
121: R97         Properties, Plants, and Equipment, Net - Schedule   HTML     57K  
                of Properties, Plants, and Equipment, Net                        
                (Details)                                                        
122: R98         Properties, Plants, and Equipment, Net - Narrative  HTML     58K  
                (Details)                                                        
123: R99         Goodwill and Other Intangible Assets - Changes in   HTML     62K  
                Carrying Amount of Goodwill (Details)                            
124: R100        Goodwill and Other Intangible Assets - Narrative    HTML     68K  
                (Details)                                                        
125: R101        Goodwill and Other Intangible Assets - Other        HTML     60K  
                Intangible Assets (Details)                                      
126: R102        Leases - Narrative (Details)                        HTML     40K  
127: R103        Leases - Operating Lease Assets and Liabilities in  HTML     52K  
                the Consolidated Balance Sheet (Details)                         
128: R104        Leases - Future Minimum Contractual Operating       HTML     57K  
                Lease Obligations (Details) (Details)                            
129: R105        Leases - Right of Use Assets (Details)              HTML     45K  
130: R106        Debt - Schedule of Long-term Debt (Details)         HTML     85K  
131: R107        Debt - Maturities of Long-term Debt (Details)       HTML     51K  
132: R108        Debt - Public Debt (Details)                        HTML     94K  
133: R109        Debt - Term Loan Facilities (Details)               HTML     73K  
134: R110        Debt - Credit Facility (Details)                    HTML     89K  
135: R111        Other Financial Instruments (Details)               HTML     47K  
136: R112        Cash Flow Information - Schedule of Cash Paid for   HTML     43K  
                Interest and Income Taxes (Details)                              
137: R113        Cash Flow Information - Narrative (Details)         HTML     49K  
138: R114        Divestitures (Details)                              HTML     51K  
139: R115        Contingencies and Commitments - Contingencies       HTML    106K  
                (Details)                                                        
140: R116        Contingencies and Commitments - Commitments         HTML     78K  
                (Details)                                                        
142: XML         IDEA XML File -- Filing Summary                      XML    251K  
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141: EXCEL       IDEA Workbook of Financial Report Info              XLSX    277K  
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144: ZIP         XBRL Zipped Folder -- 0000004281-24-000007-xbrl      Zip   1.21M  


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<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 0000022 - Disclosure - Inventories </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
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<link:definition> 0000023 - Disclosure - Properties, Plants, and Equipment, Net </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="GoodwillandOtherIntangibleAssets" roleURI="http://www.howmet.com/role/GoodwillandOtherIntangibleAssets">
<link:definition> 0000024 - Disclosure - Goodwill and Other Intangible Assets </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Leases" roleURI="http://www.howmet.com/role/Leases">
<link:definition> 0000025 - Disclosure - Leases </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Debt" roleURI="http://www.howmet.com/role/Debt">
<link:definition> 0000026 - Disclosure - Debt </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
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<link:definition> 0000027 - Disclosure - Other Financial Instruments </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="CashFlowInformation" roleURI="http://www.howmet.com/role/CashFlowInformation">
<link:definition> 0000028 - Disclosure - Cash Flow Information </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Divestitures" roleURI="http://www.howmet.com/role/Divestitures">
<link:definition> 0000029 - Disclosure - Divestitures </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="ContingenciesandCommitments" roleURI="http://www.howmet.com/role/ContingenciesandCommitments">
<link:definition> 0000030 - Disclosure - Contingencies and Commitments </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SubsequentEvents" roleURI="http://www.howmet.com/role/SubsequentEvents">
<link:definition> 0000031 - Disclosure - Subsequent Events </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.howmet.com/role/SummaryofSignificantAccountingPoliciesPolicies">
<link:definition> 9954471 - Disclosure - Summary of Significant Accounting Policies (Policies) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SummaryofSignificantAccountingPoliciesTables" roleURI="http://www.howmet.com/role/SummaryofSignificantAccountingPoliciesTables">
<link:definition> 9954472 - Disclosure - Summary of Significant Accounting Policies (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SegmentandGeographicAreaInformationTables" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationTables">
<link:definition> 9954473 - Disclosure - Segment and Geographic Area Information (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RestructuringandOtherChargesTables" roleURI="http://www.howmet.com/role/RestructuringandOtherChargesTables">
<link:definition> 9954474 - Disclosure - Restructuring and Other Charges (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="InterestCostComponentsTables" roleURI="http://www.howmet.com/role/InterestCostComponentsTables">
<link:definition> 9954475 - Disclosure - Interest Cost Components (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="OtherExpenseNetTables" roleURI="http://www.howmet.com/role/OtherExpenseNetTables">
<link:definition> 9954476 - Disclosure - Other Expense, Net (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsTables" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsTables">
<link:definition> 9954477 - Disclosure - Pension and Other Postretirement Benefits (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="IncomeTaxesTables" roleURI="http://www.howmet.com/role/IncomeTaxesTables">
<link:definition> 9954478 - Disclosure - Income Taxes (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PreferredandCommonStockTables" roleURI="http://www.howmet.com/role/PreferredandCommonStockTables">
<link:definition> 9954479 - Disclosure - Preferred and Common Stock (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="EarningsPerShareTables" roleURI="http://www.howmet.com/role/EarningsPerShareTables">
<link:definition> 9954480 - Disclosure - Earnings Per Share (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccumulatedOtherComprehensiveLossTables" roleURI="http://www.howmet.com/role/AccumulatedOtherComprehensiveLossTables">
<link:definition> 9954481 - Disclosure - Accumulated Other Comprehensive Loss (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="InventoriesTables" roleURI="http://www.howmet.com/role/InventoriesTables">
<link:definition> 9954482 - Disclosure - Inventories (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="PropertiesPlantsandEquipmentNetTables" roleURI="http://www.howmet.com/role/PropertiesPlantsandEquipmentNetTables">
<link:definition> 9954483 - Disclosure - Properties, Plants, and Equipment, Net (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 9954484 - Disclosure - Goodwill and Other Intangible Assets (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LeasesTables" roleURI="http://www.howmet.com/role/LeasesTables">
<link:definition> 9954485 - Disclosure - Leases (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="DebtTables" roleURI="http://www.howmet.com/role/DebtTables">
<link:definition> 9954486 - Disclosure - Debt (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="OtherFinancialInstrumentsTables" roleURI="http://www.howmet.com/role/OtherFinancialInstrumentsTables">
<link:definition> 9954487 - Disclosure - Other Financial Instruments (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="CashFlowInformationTables" roleURI="http://www.howmet.com/role/CashFlowInformationTables">
<link:definition> 9954488 - Disclosure - Cash Flow Information (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 9954489 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 9954490 - Disclosure - Summary of Significant Accounting Policies - Weighted-average Useful Lives of Structures and Machinery and Equipment (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 9954491 - Disclosure - Summary of Significant Accounting Policies - Weighted-average Useful Lives of Software and Other Intangible Assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SegmentandGeographicAreaInformationNarrativeDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationNarrativeDetails">
<link:definition> 9954492 - Disclosure - Segment and Geographic Area Information - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofOperatingResultsofArconicsReportableSegmentDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofOperatingResultsofArconicsReportableSegmentDetails">
<link:definition> 9954493 - Disclosure - Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="SegmentandGeographicAreaInformationScheduleofCapitalExpenditureDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofCapitalExpenditureDetails">
<link:definition> 9954494 - Disclosure - Segment and Geographic Area Information - Schedule of Capital Expenditure (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofReconciliationofCertainSegmentInformationtoConsolidatedTotalsDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofReconciliationofCertainSegmentInformationtoConsolidatedTotalsDetails">
<link:definition> 9954495 - Disclosure - Segment and Geographic Area Information - Schedule of Reconciliation of Certain Segment Information to Consolidated Totals (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofSegmentOperatingProfittoConsolidatedNetIncomelossIncomeAttributabletoArconicDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofSegmentOperatingProfittoConsolidatedNetIncomelossIncomeAttributabletoArconicDetails">
<link:definition> 9954496 - Disclosure - Segment and Geographic Area Information - Schedule of Segment Operating Profit to Consolidated Net Income (loss) Income Attributable to Arconic (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofSegmentReportingInformationtoConsolidatedAssetsDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofSegmentReportingInformationtoConsolidatedAssetsDetails">
<link:definition> 9954497 - Disclosure - Segment and Geographic Area Information - Schedule of Segment Reporting Information to Consolidated Assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
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<link:definition> 9954498 - Disclosure - Segment and Geographic Area Information - Schedule of Geographic Information for Sales (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofGeographicInformationforLonglivedAssetsDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofGeographicInformationforLonglivedAssetsDetails">
<link:definition> 9954499 - Disclosure - Segment and Geographic Area Information - Schedule of Geographic Information for Long-lived Assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="SegmentandGeographicAreaInformationScheduleofDisaggregationofRevenuebyMajorEndMarketServedDetails" roleURI="http://www.howmet.com/role/SegmentandGeographicAreaInformationScheduleofDisaggregationofRevenuebyMajorEndMarketServedDetails">
<link:definition> 9954500 - Disclosure - Segment and Geographic Area Information - Schedule of Disaggregation of Revenue by Major End Market Served (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RestructuringandOtherChargesScheduleofRestructuringandOtherChargesDetails" roleURI="http://www.howmet.com/role/RestructuringandOtherChargesScheduleofRestructuringandOtherChargesDetails">
<link:definition> 9954501 - Disclosure - Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="RestructuringandOtherChargesNarrativeDetails" roleURI="http://www.howmet.com/role/RestructuringandOtherChargesNarrativeDetails">
<link:definition> 9954502 - Disclosure - Restructuring and Other Charges - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="RestructuringandOtherChargesScheduleofRestructuringandOtherChargesbyReportableSegmentsPretaxDetails" roleURI="http://www.howmet.com/role/RestructuringandOtherChargesScheduleofRestructuringandOtherChargesbyReportableSegmentsPretaxDetails">
<link:definition> 9954503 - Disclosure - Restructuring and Other Charges - Schedule of Restructuring and Other Charges by Reportable Segments, Pretax (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="InterestCostComponentsDetails" roleURI="http://www.howmet.com/role/InterestCostComponentsDetails">
<link:definition> 9954504 - Disclosure - Interest Cost Components (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="OtherExpenseNetScheduleofOtherExpenseNetDetails" roleURI="http://www.howmet.com/role/OtherExpenseNetScheduleofOtherExpenseNetDetails">
<link:definition> 9954505 - Disclosure - Other Expense, Net - Schedule of Other Expense, Net (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="OtherExpenseNetNarrativeDetails" roleURI="http://www.howmet.com/role/OtherExpenseNetNarrativeDetails">
<link:definition> 9954506 - Disclosure - Other Expense, Net - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsNarrativeDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsNarrativeDetails">
<link:definition> 9954507 - Disclosure - Pension and Other Postretirement Benefits - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofObligationsandFundedStatusDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofObligationsandFundedStatusDetails">
<link:definition> 9954508 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofPensionPlanBenefitObligationsDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofPensionPlanBenefitObligationsDetails">
<link:definition> 9954509 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Pension Plan Benefit Obligations (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofComponentsofNetPeriodicBenefitCostDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofComponentsofNetPeriodicBenefitCostDetails">
<link:definition> 9954510 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofWeightedAverageAssumptionsUsedtoDetermineBenefitObligationsDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofWeightedAverageAssumptionsUsedtoDetermineBenefitObligationsDetails">
<link:definition> 9954511 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofAssumedHealthCareCostTrendRatesDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofAssumedHealthCareCostTrendRatesDetails">
<link:definition> 9954512 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Assumed Health Care Cost Trend Rates (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofPensionandPostretirementPlansInvestmentPolicyandWeightedAverageAssetAllocationsDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofPensionandPostretirementPlansInvestmentPolicyandWeightedAverageAssetAllocationsDetails">
<link:definition> 9954513 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofFairValueofPensionPlanAssetsDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofFairValueofPensionPlanAssetsDetails">
<link:definition> 9954514 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Fair Value of Pension Plan Assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PensionandOtherPostretirementBenefitsScheduleofFundingandCashFlowsandDefinedContributionPlansDetails" roleURI="http://www.howmet.com/role/PensionandOtherPostretirementBenefitsScheduleofFundingandCashFlowsandDefinedContributionPlansDetails">
<link:definition> 9954515 - Disclosure - Pension and Other Postretirement Benefits - Schedule of Funding and Cash Flows and Defined Contribution Plans (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
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<xs:element id="hwm_DeferredTaxAssetsValuationReleaseOfAllowance" abstract="false" name="DeferredTaxAssetsValuationReleaseOfAllowance" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_GeneralElectricCompanyMember" abstract="true" name="GeneralElectricCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ForgedWheelsMember" abstract="true" name="ForgedWheelsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_SeparationAgreementMember" abstract="true" name="SeparationAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DefinedBenefitPlanExpectedFutureBenefitPayments" abstract="false" name="DefinedBenefitPlanExpectedFutureBenefitPayments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_DebtInstrumentRedemptionPriceAmount" abstract="false" name="DebtInstrumentRedemptionPriceAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_PercentageOfCostOfGoodsSold" abstract="false" name="PercentageOfCostOfGoodsSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_SeparationAndDistributionAgreementSuretyBondsAmountOutstanding" abstract="false" name="SeparationAndDistributionAgreementSuretyBondsAmountOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceAdjustmentWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceAdjustmentWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
<xs:element id="hwm_InsuranceAnnualCoverageLimit" abstract="false" name="InsuranceAnnualCoverageLimit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_JPYTermLoanMember" abstract="true" name="JPYTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_OtherNoncurrentLiabilitiesAndDeferredCreditsMember" abstract="true" name="OtherNoncurrentLiabilitiesAndDeferredCreditsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_OtherNetStateDeferredTaxAssetMember" abstract="true" name="OtherNetStateDeferredTaxAssetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DeferredTaxAssetsValuationAcquisitionsDivestituresAndLiquidations" abstract="false" name="DeferredTaxAssetsValuationAcquisitionsDivestituresAndLiquidations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_DeferredTaxAssetsValuationAllowanceForeignTaxCredit" abstract="false" name="DeferredTaxAssetsValuationAllowanceForeignTaxCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_MinimumPercentageOfEstimatedFairValueOfReportingUnitToBeLessThanCarryingAmountOfGoodwill" abstract="false" name="MinimumPercentageOfEstimatedFairValueOfReportingUnitToBeLessThanCarryingAmountOfGoodwill" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_PeriodRequiredForOneQuantitativeImpairmentTestToBePerformedForEachReportingUnit" abstract="false" name="PeriodRequiredForOneQuantitativeImpairmentTestToBePerformedForEachReportingUnit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesTaxLossCarryforwards" abstract="false" name="DeferredTaxLiabilitiesTaxLossCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_SegmentAdjustedEBITDA" abstract="false" name="SegmentAdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ScheduleOfSharesActivityTableTextBlock" abstract="false" name="ScheduleOfSharesActivityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_NetPeriodicBenefitCostNonservice" abstract="false" name="NetPeriodicBenefitCostNonservice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_LineOfCreditFacilityNumberOfExtensionRequests" abstract="false" name="LineOfCreditFacilityNumberOfExtensionRequests" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_SixPointEightSevenFivePercentNotesDueTwoThousandTwentyFiveMember" abstract="true" name="SixPointEightSevenFivePercentNotesDueTwoThousandTwentyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ScheduleOfFinancialReceivablesTable" abstract="true" name="ScheduleOfFinancialReceivablesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="hwm_ScheduleOfCarryingValuesAndFairValuesOfOtherFinancialInstrumentsTableTextBlock" abstract="false" name="ScheduleOfCarryingValuesAndFairValuesOfOtherFinancialInstrumentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_OperatingSegmentsAndCorporateNonSegmentMember" abstract="true" name="OperatingSegmentsAndCorporateNonSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ScheduleOfInterestCostComponentsTableTextBlock" abstract="false" name="ScheduleOfInterestCostComponentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_WheelSystemsMember" abstract="true" name="WheelSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_EffectiveIncomeTaxRateReconciliationNondeductibleOfficerCompensationPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleOfficerCompensationPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_IndustrialAndOtherMember" abstract="true" name="IndustrialAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DefinedBenefitPlanServiceCostExcludingDiscontinuedOperations" abstract="false" name="DefinedBenefitPlanServiceCostExcludingDiscontinuedOperations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_RaytheonTechnologiesCorporationMember" abstract="true" name="RaytheonTechnologiesCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_EngineProductsSegmentMember" abstract="true" name="EngineProductsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_RestructuringReservePeriodExpenses" abstract="false" name="RestructuringReservePeriodExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ExtinguishmentOfDebtEarlyTerminationPremium" abstract="false" name="ExtinguishmentOfDebtEarlyTerminationPremium" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" abstract="true" name="FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_CertainCustomersMember" abstract="true" name="CertainCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
<xs:element id="hwm_AerospaceCommercialMember" abstract="true" name="AerospaceCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_JPYTermLoanAgreementDue2026Member" abstract="true" name="JPYTermLoanAgreementDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_NumberOfCleanupLocations" abstract="false" name="NumberOfCleanupLocations" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_ForeignTaxCreditCarryoverMember" abstract="true" name="ForeignTaxCreditCarryoverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_PatentLicenseAgreementMember" abstract="true" name="PatentLicenseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesDepreciation" abstract="false" name="DeferredTaxLiabilitiesDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ReceivablesPurchaseAgreementMember" abstract="true" name="ReceivablesPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DeferredTaxLiabilityInterest" abstract="false" name="DeferredTaxLiabilityInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" abstract="false" name="PercentageOfTemporaryTaxDifferencesThatReverseWithinCarryforwardPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesTaxCreditCarryforwards" abstract="false" name="DeferredTaxLiabilitiesTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_PayablesExcludedFromPensionPlanAssets" abstract="false" name="PayablesExcludedFromPensionPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_NetOtherPostRetirementBenefitsMember" abstract="true" name="NetOtherPostRetirementBenefitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_IncreaseDecreaseInSharebasedCompensation" abstract="false" name="IncreaseDecreaseInSharebasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" abstract="true" name="RecurringCostsOfManagingHazardousSubstancesAndEnvironmentalProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DebtInstrumentCovenantComplianceRatioOfConsolidatedNetDebtToConsolidatedEBITDA" abstract="false" name="DebtInstrumentCovenantComplianceRatioOfConsolidatedNetDebtToConsolidatedEBITDA" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesGross" abstract="false" name="DeferredTaxLiabilitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ScheduleOfAssetsBySegmentTable" abstract="true" name="ScheduleOfAssetsBySegmentTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="hwm_A2021RestructuringProgramsMember" abstract="true" name="A2021RestructuringProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ExpiresWithinTenYearsMember" abstract="true" name="ExpiresWithinTenYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_EngineeredStructuresMember" abstract="true" name="EngineeredStructuresMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" abstract="false" name="DefinedBenefitPlanPlanAssetsAmountExcludingCertainNetReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityMaximumAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_AmountCommittedUnderOutstandingSuretyBonds" abstract="false" name="AmountCommittedUnderOutstandingSuretyBonds" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConverted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
<xs:element id="hwm_ExpiresWithinElevenToTwentyYearsMember" abstract="true" name="ExpiresWithinElevenToTwentyYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DebtInstrumentRedemptionPriceAmountRedeemedWithCashOnHand" abstract="false" name="DebtInstrumentRedemptionPriceAmountRedeemedWithCashOnHand" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_DefinedBenefitPensionPlansNetPeriodicBenefitCost" abstract="false" name="DefinedBenefitPensionPlansNetPeriodicBenefitCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_OtherDebtMember" abstract="true" name="OtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_ReceivablesExcludedFromPensionPlanAssets" abstract="false" name="ReceivablesExcludedFromPensionPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" abstract="true" name="FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_SummaryOfSignificantAccountingPoliciesTable" abstract="true" name="SummaryOfSignificantAccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="hwm_AccountsReceivableSaleAmountOutstanding" abstract="false" name="AccountsReceivableSaleAmountOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_AerospaceDefenseMember" abstract="true" name="AerospaceDefenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalConvertedValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalConvertedValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_UnitedStatesAndCanadaMember" abstract="true" name="UnitedStatesAndCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTableTextBlock" abstract="false" name="ScheduleOfSegmentReportingInformationToConsolidateNetIncomeLossAttributableToParentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_EngineProductsAndFasteningSystemsMember" abstract="true" name="EngineProductsAndFasteningSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" abstract="false" name="PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_CorporateCenterMember" abstract="true" name="CorporateCenterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_OtherLongTermDebtIncludingUnamortizedDebtDiscountsAndIssuanceCosts" abstract="false" name="OtherLongTermDebtIncludingUnamortizedDebtDiscountsAndIssuanceCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceSharesAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPerformanceSharesAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesLossProvisions" abstract="false" name="DeferredTaxLiabilitiesLossProvisions" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_RestructuringAndOtherChargesMember" abstract="true" name="RestructuringAndOtherChargesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ReconciliationOfChangesInValuationAllowanceRollForward" abstract="true" name="ReconciliationOfChangesInValuationAllowanceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_TaxYears2010Through2012Member" abstract="true" name="TaxYears2010Through2012Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_ThreePointZeroPercentNotesDueTwoThousandTwentyNineMember" abstract="true" name="ThreePointZeroPercentNotesDueTwoThousandTwentyNineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_OtherDeferredTaxAssetsMember" abstract="true" name="OtherDeferredTaxAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_FourPointSevenFivePercentIowaFinanceAuthorityLoanDueTwoThousandFortyTwoMember" abstract="true" name="FourPointSevenFivePercentIowaFinanceAuthorityLoanDueTwoThousandFortyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_LossContingencyNumberOfEntities" abstract="false" name="LossContingencyNumberOfEntities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_DeferredTaxAssetsDepreciation" abstract="false" name="DeferredTaxAssetsDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_OtherGeographicalRegionsMember" abstract="true" name="OtherGeographicalRegionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
<xs:element id="hwm_ChangeInValuationAllowanceRelatedToDeferredStateIncomeTaxes" abstract="false" name="ChangeInValuationAllowanceRelatedToDeferredStateIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_LitigationSettlementNumberOfInstallmentPayments" abstract="false" name="LitigationSettlementNumberOfInstallmentPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_ReversalOfPriorPeriodProgramsMember" abstract="true" name="ReversalOfPriorPeriodProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_SupplierFinanceProgramAgreementTerminationNoticePeriod" abstract="false" name="SupplierFinanceProgramAgreementTerminationNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsPerformanceShareAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
<xs:element id="hwm_GainLossOnDivestituresOfAssetsAndBusinessIncludedInRestructuringCharges" abstract="false" name="GainLossOnDivestituresOfAssetsAndBusinessIncludedInRestructuringCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_SmallManufacturingFacilityInFranceMember" abstract="true" name="SmallManufacturingFacilityInFranceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_AccountsReceivableFromSecuritizationFaceAmountAfterProvisionToIncreaseLimit" abstract="false" name="AccountsReceivableFromSecuritizationFaceAmountAfterProvisionToIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_LossContingencyNumberOfInterestRateSwapTransactions" abstract="false" name="LossContingencyNumberOfInterestRateSwapTransactions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_IntermediateAndLongDurationGovernmentCreditMember" abstract="true" name="IntermediateAndLongDurationGovernmentCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsConvertedOrTransferredInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
<xs:element id="hwm_ArconicCorporationEnvironmentalObligationsMember" abstract="true" name="ArconicCorporationEnvironmentalObligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_FixedIncomeOtherMember" abstract="true" name="FixedIncomeOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" abstract="false" name="OtherComprehensiveIncomeDefinedBenefitPlanNetAmountRecognizedBeforeTaxEffect" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_SummaryOfSignificantAccountingPoliciesLineItems" abstract="true" name="SummaryOfSignificantAccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_InterestIncomeFromIncomeTaxes" abstract="false" name="InterestIncomeFromIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_USDTermLoanMember" abstract="true" name="USDTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_EngineProductsMember" abstract="true" name="EngineProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ScheduleOfAssetsBySegmentLineItems" abstract="true" name="ScheduleOfAssetsBySegmentLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_DebtInstrumentRedemptionPriceAmountRedeemedWithLoanFacility" abstract="false" name="DebtInstrumentRedemptionPriceAmountRedeemedWithLoanFacility" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" abstract="false" name="PercentageOfDeferredTaxAssetExclusiveOfReversingTemporaryDifferences" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_OtherInvestmentsOtherMember" abstract="true" name="OtherInvestmentsOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_PensionSettlementCostMember" abstract="true" name="PensionSettlementCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_EffectiveIncomeTaxRateReconciliationTaxCreditForeignDevelopmentIncentivesAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditForeignDevelopmentIncentivesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="hwm_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_OtherExitCostsMember" abstract="true" name="OtherExitCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_AerospaceMember" abstract="true" name="AerospaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_StructureSystemsMember" abstract="true" name="StructureSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_AccountsReceivableFromSecuritizationAmountDrawn" abstract="false" name="AccountsReceivableFromSecuritizationAmountDrawn" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_OtherIntangibleAssetsTableTextBlock" abstract="false" name="OtherIntangibleAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_DeferredTaxLiabilitiesEmployeeBenefits" abstract="false" name="DeferredTaxLiabilitiesEmployeeBenefits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_CommercialTransportationMember" abstract="true" name="CommercialTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCostDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_PreferredStockNumberOfClasses" abstract="false" name="PreferredStockNumberOfClasses" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="hwm_ScheduleOfFinancialReceivablesLineItems" abstract="true" name="ScheduleOfFinancialReceivablesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" abstract="false" name="EffectiveIncomeTaxReconciliationUnitedStatesAndResidualTaxOnForeignEarningsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
<xs:element id="hwm_PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" abstract="false" name="PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="hwm_ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" abstract="false" name="ScheduleOfProFormaRestructuringChargesByReportableSegmentBeforeIncomeTaxTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
<xs:element id="hwm_EquitiesEquitySecuritiesMember" abstract="true" name="EquitiesEquitySecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_CorporateAircraftMember" abstract="true" name="CorporateAircraftMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_OtherComprehensiveIncomeLossBeforeReclassificationAbstract" abstract="true" name="OtherComprehensiveIncomeLossBeforeReclassificationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="hwm_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" abstract="true" name="FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_AlcoaCorporationWorkersCompensationClaimsMember" abstract="true" name="AlcoaCorporationWorkersCompensationClaimsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
<xs:element id="hwm_ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" abstract="false" name="ScheduleOfExpirationPeriodsOfDeferredTaxAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
</xs:schema>


44 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 7/31/23  Howmet Aerospace Inc.             8-K:1,2,8,9 7/27/23   12:1.1M                                   Toppan Merrill/FA
 5/02/23  Howmet Aerospace Inc.             10-Q        3/31/23   82:6.7M
 2/14/23  Howmet Aerospace Inc.             10-K       12/31/22  138:19M
12/08/22  Howmet Aerospace Inc.             8-K:5,9    12/02/22   12:250K                                   Toppan Merrill/FA
 2/14/22  Howmet Aerospace Inc.             10-K       12/31/21  146:21M
10/14/21  Howmet Aerospace Inc.             8-K:5,9    10/14/21   13:331K                                   Toppan Merrill/FA
 9/23/21  Howmet Aerospace Inc.             8-K:5,9     9/17/21   13:410K                                   Toppan Merrill/FA
 9/01/21  Howmet Aerospace Inc.             8-K:2,8,9   9/01/21   15:587K                                   Toppan Merrill/FA
 8/04/21  Howmet Aerospace Inc.             10-Q        6/30/21   92:10M
 2/16/21  Howmet Aerospace Inc.             10-K       12/31/20  151:22M
11/09/20  Howmet Aerospace Inc.             10-Q        9/30/20   95:12M
 6/12/20  Howmet Aerospace Inc.             8-K:5,9     6/09/20   12:279K                                   Toppan Merrill/FA
 5/07/20  Howmet Aerospace Inc.             10-Q        3/31/20   87:8.2M
 4/24/20  Howmet Aerospace Inc.             8-K:2,8,9   4/24/20   15:575K                                   Toppan Merrill/FA
 4/16/20  Howmet Aerospace Inc.             S-3ASR      4/16/20    6:462K                                   Toppan Merrill/FA
 4/13/20  Howmet Aerospace Inc.             8-K:1,9     4/10/20   12:253K                                   Toppan Merrill/FA
 4/06/20  Howmet Aerospace Inc.             8-K:1,2,5,7 3/31/20   26:24M                                    Toppan Merrill/FA
 2/27/20  Howmet Aerospace Inc.             10-K       12/31/19  145:22M
 2/25/20  Howmet Aerospace Inc.             8-K:5,7,9   2/24/20   15:11M                                    Toppan Merrill/FA
 8/02/19  Howmet Aerospace Inc.             8-K:5,9     8/01/19    2:101K                                   Toppan Merrill/FA
 5/01/19  Howmet Aerospace Inc.             10-Q        3/31/19   95:7.2M
 2/21/19  Howmet Aerospace Inc.             10-K       12/31/18  149:20M
 8/02/18  Howmet Aerospace Inc.             10-Q        6/30/18   88:9.3M
 5/01/18  Howmet Aerospace Inc.             10-Q        3/31/18   83:6.6M
 2/26/18  Howmet Aerospace Inc.             10-K       12/31/17  163:20M
 1/25/18  Howmet Aerospace Inc.             8-K:1,9     1/19/18    2:111K                                   Toppan Merrill/FA
 1/08/18  Howmet Aerospace Inc.             8-K:5,7,9   1/03/18    2:38K                                    Toppan Merrill/FA
 1/04/18  Howmet Aerospace Inc.             8-K:1,2,3,512/31/17    8:1.7M                                   Toppan Merrill/FA
12/19/17  Howmet Aerospace Inc.             8-K:1,5,9  12/19/17    4:150K                                   Toppan Merrill/FA
 8/02/17  Howmet Aerospace Inc.             10-Q        6/30/17   75:5.9M                                   Donnelley … Solutions/FA
 5/22/17  Howmet Aerospace Inc.             8-K:1,5,9   5/21/17    3:126K                                   Donnelley … Solutions/FA
 2/28/17  Howmet Aerospace Inc.             10-K       12/31/16  176:18M                                    Donnelley … Solutions/FA
11/04/16  Howmet Aerospace Inc.             8-K:1,2,5,910/31/16   13:6.1M                                   Donnelley … Solutions/FA
 7/29/16  Howmet Aerospace Inc.             10-Q        6/30/16   86:8M                                     Donnelley … Solutions/FA
 9/22/14  Howmet Aerospace Inc.             8-K:1,2,8,9 9/22/14    5:173K                                   Donnelley … Solutions/FA
 5/08/13  Howmet Aerospace Inc.             8-K:5,9     5/03/13    7:338K                                   Donnelley … Solutions/FA
 2/17/09  Howmet Aerospace Inc.             10-K12/31/08   27:3.6M                                   Donnelley … Solutions/FA
 7/15/08  Howmet Aerospace Inc.             8-K:8,9     7/10/08    7:294K                                   Donnelley … Solutions/FA
 1/25/07  Howmet Aerospace Inc.             8-K:8,9     1/22/07    7:212K                                   Donnelley … Solutions/FA
 9/20/06  Howmet Aerospace Inc.             8-K:1,8,9   9/15/06    5:99K                                    Donnelley … Solutions/FA
10/26/04  Howmet Aerospace Inc.             10-Q        9/30/04   13:1.6M                                   Donnelley … Solutions/FA
 7/22/99  Howmet Aerospace Inc.             10-Q        6/30/99    6:121K
 3/12/99  Howmet Aerospace Inc.             10-K       12/31/98   13:424K
 3/11/96  Howmet Aerospace Inc.             10-K405    12/31/95   12:193K
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