Preparation of semi-solid billet of magnesium alloy and its thixoforming  

作　　者：姜巨福 罗守靖 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology

出　　处：《中国有色金属学会会刊：英文版》2007年第1期46-50,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50605015)supported by the National Natural Science Foundation of China

摘　　要：Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angularextrusion to magnesium alloy.The results show that mechanical properties of AZ91D alloy at room temperature,such as yieldstrength(YS),ultimate tensile strength(UTS)and elongation,are enhanced greatly by four-pass equal channel angularextrusion(ECAE)at 573 K and microstructure of AZ91D alloy is refined to the average grain size of 20μm.Through using ECAE asstrain induced step in SIMA and completing melt activated step by semi-solid isothermal treatment,semi-solid billet with finespheroidal grains of 25μm can be prepared successfully.Compared with common SIMA,thixoformed satellite angle framecomponents using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and hightemperature of 373 K.Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angular extrusion to magnesium alloy. The results show that mechanical properties of AZ91D alloy at room temperature, such as yield strength（YS）, ultimate tensile strength（UTS） and elongation, are enhanced greatly by four-pass equal channel angular extrusion（ECAE） at 573 K and microstructure of AZ91D alloy is refined to the average grain size of 20 μm. Through using ECAE as strain induced step in SIMA and completing melt activated step by semi-solid isothermal treatment, semi-solid billet with fine spheroidal grains of 25 μm can be prepared successfully. Compared with common SIMA, thixoformed satellite angle frame components using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and high temperature of 373 K.

关 键 词：镁合金 触变性 型坯 机械性能 微观结构 

分 类 号：TG249.9[金属学及工艺—铸造]