Structures and mechanical properties of ECAP processed 7075 AI alloy upon natural aging and T651 treatment.
- Yonghao
- Ruslan Zufarovich
- Yuntian Theodore
Equal-channel angular pressing (ECAP) processed ultrafine grained (UFG) and coarse grained (CG) 7075 Al alloys were treated by natural aging and T651 temper (annealed at 120 C for 48 h in Ar atmosphere), respectively. Mechanical tests showed that for the UFG sample, the natural aging resulted in the highest strength (the ultimate tensile strength is 720 MPa). In contrast, for the CG sample, the T651 treatment resulted in the higher strength (the ultimate strength is 590 MPa) than the natural aging (530 MPa). Microstructural analyses indicated that the enhanced strength of the T651 treated CG sample was mainly caused by high densities of G-P zones and metastable {eta}{prime} precipitate. The enhanced strength of the naturally aged UFG sample was mainly caused by the high densities of G-P zones and dislocations. Upon T65 1 treatment, the dislocation density of the UFG sample deceased significantly, overcompensating the precipitation strengthening.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 977542
- Report Number(s):
- LA-UR-04-2432; TRN: US201009%%833
- Resource Relation:
- Conference: Submiited to 2004 MRS Spring Conference Proceedings, San Francisco, CA, April 12-16, 2004
- Country of Publication:
- United States
- Language:
- English
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