( 1. 西安交通大学 机械工程学院， 西安 710049；
2. 南京理工大学 材料系， 南京 210094)
摘 要: 研究经多道次等径弯曲通道变形后Al-3%Mg-0.5% Zr铝合金的超塑性行为。研究表明： 晶粒尺寸由变形前的50μm经过8道次等径弯曲通道变形后细化为0.3μm; 随后， 在330℃退火保温1h的条件下， 其晶粒尺寸长大至10μm； 在500℃、应变速率1×10-3s-1的拉伸实验中，该超细晶材料的最大延伸率高达370%，呈现出良好的超塑性。
关键字: 等径弯曲通道变形; 超细晶材料; Al-3%Mg-0.5%Zr合金
（ 1. School of Mechanical Engineering, Xi′an Jiaotong University, Xi′an 710049, China;
2. Department of Materials Science and Engineering,
Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: Superplastic behavior of ultrafine-grained Al-3%Mg-0.5%Zr alloy by multi-pass equal channel angular pressing was researched. Investigation shows that the grain size is reduced from 50μm in the as-received microstructure to 0.3μm after equal channel angular pressing to a total of 8 passes. The grain size is increased to 10μm on subsequent annealing at 330℃ for 1h. A maximum elongation of 370% is achieved at 500℃ with an initial strain rate of 1×10-3s-1 when testing in tension and better superplastic behavior is abtained in the ultrafine-grained material.
Key words: equal channel angular pressing; ultrafine-grained material; Al-3%Mg-0.5%Zr alloy
