中国铸造2008，Vol.5Issue(4)：234-239,6.
Microstructural evolution of equal channel angular pressed AZ91D magnesium alloy during semi-solid isothermal heat treatment
Microstructural evolution of equal channel angular pressed AZ91D magnesium alloy during semi-solid isothermal heat treatment
摘要
Abstract
The microstructural evolution of AZ91D magnesium alloy processed by equal channel angular pressing during isothermal heat treatment at 570℃ was investigated. The results indicated that the equal channel angular pressing followed by semi-solid isothermal heat treatment was an effective method to prepare semi-solid nondendritic slurry of AZ91D magnesium alloy. During this process, its microstructure change underwent four stages, the initial coarsening stage, the structure separation stage, the spheroidization stage and the final coarsening stage. The microstructural spheroidization effect was the best after being heated for 15 min for the alloy pressed for four passes, and the grain size was the smallest. With the further increase of heating time, the grain size and shape factor increased. When the heating time was kept constant, the grain size and shape factor decreased with the increase of pressing passes.关键词
AZ91D magnesium alloy/semi-solid isothermal heat treatment/microstructure/semi-solid formingKey words
AZ91D magnesium alloy/semi-solid isothermal heat treatment/microstructure/semi-solid forming分类
矿业与冶金引用本文复制引用
Chen Tijun,Lu Guoxiang ,Hao Yuan..Microstructural evolution of equal channel angular pressed AZ91D magnesium alloy during semi-solid isothermal heat treatment[J].中国铸造,2008,5(4):234-239,6.基金项目
This work was supported by the National Basic Research Program of China(grant No.G2007CB613706),the Development Program for Outstanding Young Teachers in Lanzhou University of Technology and the Opening Foundation of State Key Laboratory of Advanced Non-ferrous Materials. （grant No.G2007CB613706）
