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Microstructural evolution during aging of an al-cu-li-ag-mg-zr alloy
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pickens, Joseph R. Brown, S. A. Kumar, K. S. |
| Copyright Year | 1991 |
| Description | Alloys in the Al-Cu-Li Ag-Mg subsystem were developed that exhibit desirable combinations of strength and ductility. These Weldalite (trademark) alloys, are unique for Al-Cu-Li alloys in that with or without a prior cold stretching operation, they obtain excellent strength-ductility combinations upon natural and artificial aging. This is significant because it enables complex, near-net shape products such as forgings and super plastically formed parts to be heat treated to ultra-high strengths. On the other hand, commercial extrusions, rolled plates and sheets of other Al-Cu-Li alloys are typically subjected to a cold stretching operation before artificial aging to the highest strength tempers to introduce dislocations that provide low-energy nucleation sites for strengthening precipitates such as the T(sub 1) phase. The variation in yield strength (YS) with Li content in the near-peak aged condition for these Weldalite (trademark) alloys and the associated microstructures were examined, and the results are discussed. |
| File Size | 1981986 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910015095 |
| Archival Resource Key | ark:/13960/t4rj9c29f |
| Language | English |
| Publisher Date | 1991-05-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Nucleation Ductility Magnesium Alloys Stretch Forming Aluminum Alloys Temper Metallurgy Precipitates Lithium Alloys Forging High Strength Steels Copper Alloys Yield Strength Cold Working Aging Metallurgy Microstructure Silver Alloys Zirconium Alloys Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
