(1. 清华大学 机械工程系 清华-东洋镁铝合金成形技术研究开发中心，北京 100084;
2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要:
关键字: AZ91D镁合金; 孪晶; 高温压缩; 再结晶
during high temperature compression
（1. Tsinghua-ToYo Research and Development Center of Magnesium and Aluminum Alloys
Processing Technology, Department of Mechanical Engineering, Tsinghua University,
Beijing 100084, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:High temperature compression tests of AZ91D magnesium alloy were performed on Gleeble-1500 thermal mechanical simulator at strain rate of 0.01 s−1 and temperature of 400 ℃. The microstructure evolution of the alloy during compression was examined by optical microscope (OM) and transmission electron microscope (TEM). The results show that {1012} twin is primary deformation mechanism and the size of twins is larger at the initial stage of compressive deformation, however, these larger twins will be fragmented and become small under large deformation. With the increasing of strain, some twins cross each other and dynamic recrystallization (DRX) grains are nucleated at twin boundaries and twin intersections.
Key words: AZ91D magnesium alloy; twins; high temperature compression; recrystallization
