Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第6卷    第3期    总第20期    1996年9月

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文章编号:(1996)03-154-4
Zn-22% Al合金的电致超塑性效应
李尧 董晓华

(湖北工学院机械工程系,武汉430068)

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。

 

关键字: 电致超塑性 Zn-22% Al合金 位错

ELECTROSUPERPLASTIC EFFECT
OF Zn-22%Al ALLOY
Li Yao, Dong Xiaohua

Department of Mechanical Engineering,
Hubei Institute of Technology, Wuhan 430068

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.

 

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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