Enhanced superplasticity of magnesium alloy AZ31 obtained through equal-channel angular pressing with back-pressure

被引：40

作者：

Lapovok, R. ^{[1
]}

Estrin, Y. ^{[1
,2
]}

Popov, M. V. ^{[3
]}

Rundell, S. ^{[1
]}

Williams, T. ^{[4
]}

机构：

[1] Monash Univ, Dept Mat Engn, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia

[2] CSIRO, Div Mat Sci & Engn, Clayton, Vic 3168, Australia

[3] Tech Univ Clausthal, IWW, D-38678 Clausthal Zellerfeld, Germany

[4] Monash Univ, Monash Ctr Electron Microscopy, Clayton, Vic 3800, Australia

来源：

JOURNAL OF MATERIALS SCIENCE | 2008年 / 43卷 / 23-24期

基金：

澳大利亚研究理事会;

关键词：

D O I：

10.1007/s10853-008-2685-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Excellent superplastic elongations (in excess of 1,200%) were achieved in a commercial cast AZ31 alloy processed by low temperature equal-channel angular pressing (ECAP) with a back-pressure to produce a bimodal grain structure. In contrast, AZ31 alloy processed by ECAP at temperatures higher than 200 A degrees C showed a reasonably uniform grain structure and relatively low ductility. It is suggested that a bimodal grain structure is advantageous because the larger grains contribute to strain hardening thus delaying the onset of necking, while grain boundary sliding associated with small grains provides a stabilizing effect due to enhanced strain rate sensitivity.

引用

页码：7372 / 7378

页数：7

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