(1. 山东大学 材料液态结构及其遗传性教育部重点实验室, 济南 250061;
2.石油大学 机械与材料学院, 东营 257061;
3. 华东理工大学 环境与资源工程学院,上海 200237)
摘 要: 采用恒速度法测量了稀土Zn-5Al共晶合金的塑性拉伸曲线,结合金相组织研究了稀土对其超塑性特性的影响。结果表明:在Zn-5Al合金中添加0.05%~0.2%(质量分数,下同)的稀土Ce, 可提高合金超塑变形的延伸率,在350℃以上进行超塑拉伸时,稀土抑制Zn向Al中的扩散和溶解,阻碍扩散-溶解层达到饱和,有利于α/β相界的滑移,从而增强了Zn-5Al合金的超塑性效应。
关键字: 锌铝合金; 超塑性; 稀土
Zn-Al eutectic alloy
(1. Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education, Shandong University, Ji′nan 250061, P.R.China;
2. College of Mechanical and Materials Engineering,
University of Petroleum, Dongying 257061, P.R.China;
3. College of Resource and Environment Engineering,
East China University of Science and Technology, Shanghai 200237, P.R.China)
Abstract:The superplastic deformation curves of Zn-5Al eutectic alloy containing small amounts of rare earths were measured, and the influence of rare earth on the superplasticity was discussed. The results show that the elongation of Zn-5Al eutectic alloy can be increased if less than 0.2% Ce were added, and the rare earth can refrain the diffusion and dissolution of Zn to Al and postpone the saturation of the diffusion-solution zone above 350℃, and in such a way boost up α/β interface sliding and benefit the superplasticity.
Key words: Zn-Al alloy; superplasticity; rare earth