中文摘要：

镁合金和 thixoforming 的半固体营舍的准备被使用相等的隧道调查尖挤出到镁合金。结果显示出那在房间温度的 AZ91D 合金的机械性质例如收益力量( YS )，最终的张力的力量( UTS )和延伸，由四通行证的相等的隧道极大地被提高在 AZ91D 合金的 573 K 和微观结构的尖挤出( ECAE )被精制到平均谷物尺寸 of20 μm 。直用是的 ECAE，紧张在 SIMA 导致了步并且完成融化激活的步 bysemi 固体等温的处理，有 25 μ m 的好球状的谷物的半固体营舍能成功地被准备。与普通 SIMA 相比， thixoformed 卫星角度框架部件 usingsemi 固体营舍由新 SIMA 准备了在房间温度和 373 K 的高温度有更高机械的性质。

英文摘要：

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.