Grain refinement of commercial magnesium alloys for high-strain-rate-superplastic forming

被引:42
|
作者
Mukai, T
Watanabe, H
Higashi, K
机构
[1] Osaka Municipal Tech Res Inst, Joto Ku, Osaka 5368553, Japan
[2] Univ Osaka Prefecture, Dept Met & Mat Sci, Sakai, Osaka 5998531, Japan
来源
MAGNESIUM ALLOYS 2000 | 2000年 / 350-3卷
关键词
equal-channel-angular-extrusion; extrusion; grain refinement; high-strain-rate-superplasticity; powder metallurgy; thermomechanical process;
D O I
10.4028/www.scientific.net/MSF.350-351.159
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Superplasticity usually occurs when grain size is small, typically less than similar to 10 mum In this study, the deformation mechanisms at elevated temperatures in magnesium alloy with different grain sizes are discussed. From the discussion, the grain requirement for high strain rate superplasticity (10(-2) similar to 10(0) s(-1)) is derived. The strain rate range is chosen because it corresponds to the forming rate in commercial mass-production. Four different processing routes for grain refinement are presented and the developed grain structures are compared. Finally, a fine-grained magnesium alloy fabricated by commercial extrusion route is selected to demonstrate the proposed high strain rate superplastic forming at a strain rate of similar to 10(-2) s(-1).
引用
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页码:159 / 170
页数:12
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