Superplasticity of Mg-Gd-Y alloy in tensile test atelevated temperature

来源期刊:中国有色金属学报(英文版)2007年增刊第1期

论文作者:肖阳 张新明 邓运来 范晓慧

文章页码:372 - 375

Key words:Mg-Gd-Y; ductility; superplasticity; microstructure

Abstract: The high tensile ductility of Mg-Gd-Y alloy at temperatures above 623 K and average engineering strain rate of 4.6×10-4 s-1 was investigated. The results show that the high ductility (elongation 77%) at 623 K is attributed to the basal, non-basal dislocations glides. The superplasticity deformation (elongation 180%) at 673 K includes three stages. The first stage is the plastic deformation induced by dislocation gliding and twining. The second stage is the grain refinement controlled by dynamic recrystallization. The third stage includes two processes of the fine grain growth and grain refinement of the elongated grain with high stored energy.

基金信息:the National Basic Research Program of China

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