搅拌工艺参数对SIMA法半固态AZ91D镁合金组织的影响

Influence of Stirring Technological Parameters on Semi-solid by SIMA Method Microstructures of AZ91D Alloy

采用自行设计制造的半固态镁合金机械搅拌装置，制备了镁合金半固态浆料，研究了搅拌工艺参数对半固态镁合金组织的影响。结果表明：镁合金半固态等温搅拌温度在570～580℃，搅拌时间为6～9min时，获得的组织均匀细小。搅拌时间过长，晶粒尺寸反而有所增大。搅拌温度影响固相率，从而也影响到固相晶粒的圆整度。

The semi-solid metal slurry of AZ91D magnesium alloy was prepared by a self-made mechanical stirring setting. The effect of technological parameters on the rheological behavior of semi-solid magnesium alloy was studied. The results show that the uniform and fine microstructures can be obtained while temperature is hold at 570 ℃～580℃, and stirring duration is around 6～9 mins. If the stirring duration lasts too long, the grain size will increase. The stirring temperature affects the ratio of solid phase, thus affects the roundness of grains.