当加热温度和保温时间一定时，随着挤压次数的增加，二次加热组织的晶粒尺寸减小。
When remelted temperature and holding time are constant, with the increment of number times of extrusion the crystal grain becomes small.
介绍了镁合金半固态触变成形技术中的三个关键技术：非枝晶组织半固态浆料的制备、坯料的二次加热、半固态触变压铸成形。
This paper introduced the key technology of SSP(semi-soild process) thixomolding of magnesium alloys : the preparation of non-dendritic structure, reheating, thixomolding.
结果表明： 等径道角挤压后二次加热等温处理是一种适于AZ91D镁合金的制坯方法， 加热温度对坯料的组织有很大影响。
The results show that reheating the AZ91D magnesium alloy extruded by an equal channel die is a kind of good method of preparing AZ91D magnesium alloy billets.
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