Grain boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation

被引：53
|
作者：
Kawasaki, Megumi [1 ,2 ]
Langdon, Terence G. [1 ,2 ,3 ]
机构：
[1] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[2] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
[3] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
MATERIALS TRANSACTIONS | 2008年 / 49卷 / 01期
关键词：
equal-channel angular pressing; grain boundary sliding; superplasticity; ultrafine grains; zinc-aluminum alloy;
D O I：
10.2320/matertrans.ME200720
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A Zn-22% Al eutectoid alloy was processed by Equal-Channel Angular Processing (ECAP) to produce a grain size of similar to 0.8 mu m. Tensile testing at 473 K gave a maximum elongation of similar to 2230% at a strain rate of 1.0 x 10(-2) s(-1). The significance of grain boundary sliding was evaluated by taking measurements of offsets in surface marker lines at an elongation of 30%. The highest sliding contribution was recorded under testing conditions corresponding to the maximum superplastic elongation. Detailed measurements showed that relatively large offsets occurred at the Zn-Zn and Zn-Al interfaces but there were smaller offsets at the Al-Al interfaces. It is concluded that grain boundary sliding is the dominant flow process during superplastic deformation.
引用
收藏
页码：84 / 89
页数：6
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