(1. 山東大學(xué) 材料液態(tài)結(jié)構(gòu)及其遺傳性教育部重點實驗室， 濟南 250061；
2.石油大學(xué) 機械與材料學(xué)院， 東營 257061；
3. 華東理工大學(xué) 環(huán)境與資源工程學(xué)院，上海 200237)
摘 要: 采用恒速度法測量了稀土Zn-5Al共晶合金的塑性拉伸曲線，結(jié)合金相組織研究了稀土對其超塑性特性的影響。結(jié)果表明：在Zn-5Al合金中添加0.05%～0.2%(質(zhì)量分?jǐn)?shù)，下同)的稀土Ce, 可提高合金超塑變形的延伸率，在350℃以上進(jìn)行超塑拉伸時，稀土抑制Zn向Al中的擴散和溶解，阻礙擴散-溶解層達(dá)到飽和，有利于α/β相界的滑移，從而增強了Zn-5Al合金的超塑性效應(yīng)。
關(guān)鍵字: 鋅鋁合金； 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
