EFFECT OF PREDEFORMATION MANNER ON SEMI-SOLID STRUCTURE OF AZ61 MAGNESIUM ALLOY IN SIMA PROCESS  

作　　者：G.P. Chen T.R. Zhou H. Yan 

机构地区：[1]School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330000, China [2]School of Mechanical Engineering, Hunan Industrial University, Zhuzhou 412008, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2008年第3期197-204,共8页金属学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China （No.50465003）.

摘　　要：The effect of predeformation manner, predeformation ratio and isothermal heat-treat parameter on the non-dendrite structure of AZ61 magnesium alloy in SIMA process was studied. Under coequal heat-treat condition, the impact of the hot upsetting pre- deformation on semi-solid microstructure in SIMA process was compared with that of the cold compressive predeformation. The results indicate that non-dendrite microstructure in AZ61 magnesium alloy billets can be obtained by hot or cold upsetting predeformation in SIMA process, although their mechanisms of evolution are different. Increasing hot or cold upsetting predeformation ratio can enhance the effect and quality of the non-dendrite microstructure formed before storage energy up to saturation, but the proper isothermal temperature and holding time should be selected.The effect of predeformation manner, predeformation ratio and isothermal heat-treat parameter on the non-dendrite structure of AZ61 magnesium alloy in SIMA process was studied. Under coequal heat-treat condition, the impact of the hot upsetting pre- deformation on semi-solid microstructure in SIMA process was compared with that of the cold compressive predeformation. The results indicate that non-dendrite microstructure in AZ61 magnesium alloy billets can be obtained by hot or cold upsetting predeformation in SIMA process, although their mechanisms of evolution are different. Increasing hot or cold upsetting predeformation ratio can enhance the effect and quality of the non-dendrite microstructure formed before storage energy up to saturation, but the proper isothermal temperature and holding time should be selected.

关 键 词：AZ61 magnesium alloy Strain-induced melt activated （SIMA） Hot and cold upsetting PREDEFORMATION Non-dendrite structure 

分 类 号：TG13[一般工业技术—材料科学与工程]