轧态Zn-5Al-RE合金的超塑性研究  

Superplastic Deformation of Rolled Zn-5Al-RE Alloy

作　　者：刘宇慧[1] 石志强[1] 李世春[1] 

机构地区：[1]石油大学机电工程学院,山东东营257061

出　　处：《机械工程材料》2004年第5期11-13,19,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(59871031)

摘　　要：用恒载荷法研究了轧态Zn 5Al RE合金的组织超塑性和相变超塑性的蠕变特征,测定了轧态Zn 5Al RE合金超塑变形的激活能Q值和应变速率敏感指数m值。试验结果表明:当载荷减小、温度降低和淬火保温时间延长时,组织超塑性变形中稳态蠕变阶段延长;粗晶粒可降低组织超塑性变形时的伸长率,但对相变超塑性变形的伸长率影响不大;组织超塑性变形的m值大于相变超塑性变形的m值;轧态Zn 5Al RE合金的表观激活能略大于Zn 5Al合金的激活能。The fine-structure and transformation superplasticity of rolled Zn-5Al-RE were investigated with the constant load creep method. The superplastic deformation activation energy Q and strain-rate-sensitivity exponent m of rolled Zn-5Al-RE alloy under conditions of constant temperature and thermal cycle were measured. Experimental results showed that the quasi-steady stage could last much longer with decreasing load and temperature or increasing holding time of quenching; large grains could reduce the elongation of the fine-structure superplasticity, but had little effect on that of the transformation superplasticity; the strain-rate-sensitivity exponent m of the fine-structure superplasticity was greater than that of the transformation superplasticity; and the apparent activation energy Q of Zn-5Al-RE was greater than that of Zn-5Al.

关 键 词：超塑性 Zn-5A1-RE合金 激活能 应变速率敏感指数 轧态合金 

分 类 号：TG146.1[一般工业技术—材料科学与工程]