Enhancement of strength and superplasticity in a 6061 Al alloy processed by equal-channel-angular-pressing
- Authors
- Kim, WJ; Kim, JK; Park, TY; Hong, SI; Kim, DI; Kim, YS; Lee, JD
- Issue Date
- Oct-2002
- Publisher
- SPRINGER
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.33, no.10, pp.3155 - 3164
- Journal Title
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
- Volume
- 33
- Number
- 10
- Start Page
- 3155
- End Page
- 3164
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/26795
- DOI
- 10.1007/s11661-002-0301-4
- ISSN
- 1073-5623
- Abstract
- Pre-equal-channel-angular-pressing (ECAP) solution treatment combined with post-ECAP aging treatment has been found to be effective in enhancing the room-temperature strength of 6061 aluminum alloy. The largest increase in ultimate tensile strength (UTS) (=460 MPa) and yield stress (YS) (=425 MPa) is obtained in post-ECAP aged 6061 Al with six pressings. The strength increases by a factor of 1.4 when compared to T6 treated commercial 6061 Al. The strength of 6061 Al obtained in the present research is higher than that of ECA-pressed 6061 Al with pre-ECAP peak-aging treatment studied by other investigators. The more effective strengthening of post-ECAP low-temperature aging may be linked with the higher dislocation accumulation rate in the solutionized matrix and the presence of higher density particles in the aged matrix. Modest low-temperature (523 K) and high-temperature (813 K) superplasticity is observed in the ECAP 6061 Al, which may be a result of increased grain boundary area from grain refinement.
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