Zn-22% Al合金的电致超塑性效应

来源期刊：中国有色金属学报1996年第3期

论文作者：李尧 董晓华

文章页码：154 - 157

关键词：电致超塑性 Zn-22% Al合金 位错

Key words：electro-superplasticity　Zn-22%Al alloy　dislocation

摘    要：以普通处理的Zn-22% Al合金为研究对象，研究了脉冲电流对其超塑性效应的影响。结果表明，合金的延伸率显著提高并以更高的m值为特征；最佳超塑变形温度扩宽为一区间。电镜观察表明，合金局部表现出强烈的变形强化特征，同时局部又以很高的应力松驰为特点，这两个过程达到动态平衡，有效地提高了合金的均匀变形能力。

Abstract: The effect of pulse electric current on the superplasticity of the common-treated Zn-22% Al alloy was studied. The results showed that the elongation of the alloy was appreciably increased, which was characterized by a higer mvalue, and the optimum superplastic deformation temperature was enlarged to be a temperature range. With the SEM, we could find that part of the alloy exhibited strong deformation-strengthened character, and concurrently occurred high stress relaxation. These two processes reached dynamic equilibrium, which increased the homogeneous deformability effectively.