Superplasticity in Nb3Al/Nb in-situ composites

被引：0
|
作者：
Hanada, S [1 ]
Fang, W [1 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
SUPERPLASTICITY-CURRENT STATUS AND FUTURE POTENTIAL | 2000年 / 601卷
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructures of a binary Nb-15.8at%Al alloy ingot were controlled by isothermal forging and heat treatment to produce equiaxed, fine grains of Nb3Al and Nb solid solution (Nb-ss). Nb3Al/Nb-ss, two phase alloy (in-situ composite) is found to exhibit superplasticity especially when one of the constituent phases, Nb-ss is supersaturated. During superplastic deformation Nb-ss transforms to Nb3Al, and Al content in Nb-ss decreases. After superplastic deformation the microstructure consisting of equiaxed grains is left unchanged, although a slight grain growth is observed. It is suggested that stress induced by grain boundary sliding is effectively accommodated through dislocation glide and climb in the soft Nb-ss.
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页码：15 / 24
页数：10
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