半固态AZ91D镁合金压铸过程的数值模拟

Numerical simulation of die casting process of semi-solid AZ91D magnesium alloy

采用机械搅拌方式研究了半固态AZ91D合金的流变特性,并根据实验数据,拟合出剪切速率为238s-1时,半固态AZ91D合金的固相体积分数和表观粘度之间的关系式。从流体力学的角度,采用数值技术对半固态AZ91D镁合金的压铸过程进行了研究。数值模拟结果表明,半固态浆料温度为550℃、模具温度为300℃、压铸速度为1m/s时,该文所设计的压铸件的压铸过程能很好地进行。同时,该研究工作能为分析压铸成形过程提供有益的信息。

The theological property of semi-solid AZ91D magnesium alloy slurry is studied. Based on the experimental data a relationship of solid fraction with apparent viscosity has been got. The numerical technique is applied to simulate die casting process of semi-solid AZ91D magnesium alloy. Some useful information is obtained. It is showing that die casting process which designed in this paper is practicable at the circumstance that die temperature is 300℃, the velocity of die casting is 1m/s, and slurry tempera- ture of AZ91D semi-solid alloy is 550℃.