(湖北工學院機械工程系，武漢430068)
摘 要: 以普通處理的Zn-22% Al合金為研究對象，研究了脈沖電流對其超塑性效應的影響。結果表明，合金的延伸率顯著提高并以更高的‑m值為特征；最佳超塑變形溫度擴寬為一區(qū)間。電鏡觀察表明，合金局部表現(xiàn)出強烈的變形強化特征，同時局部又以很高的應力松馳為特點，這兩個過程達到動態(tài)平衡，有效地提高了合金的均勻變形能力。
關鍵字: 電致超塑性 Zn-22% Al合金 位錯
OF Zn-22%Al ALLOY
（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
