Enhancement of strength and superplasticity in a 6061 Al alloy processed by equal-channel-angular-pressing

被引：175

作者：

Kim, WJ ^{[1
]}

Kim, JK

Park, TY

Hong, SI

Kim, DI

Kim, YS

Lee, JD

机构：

[1] Hongik Univ, Dept Met & Mat Sci, Seoul 1217941, South Korea

[2] POSCO, Tech Res Lab, Iron & Steelmaking Res Team, Pohang 790785, South Korea

[3] Kookmin Univ, Sch Met & Mat Engn, Seoul 136702, South Korea

[4] Kunsan Natl Univ, Dept Mat Sci & Engn, Jeollabuk Do 573701, South Korea

[5] Chungnam Natl Univ, Dept Met Engn, Taejon 305764, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2002年 / 33卷 / 10期

关键词：

D O I：

10.1007/s11661-002-0301-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：3155 / 3164

页数：10

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