对有外加SiC颗粒(SiCp)的Al-7.0%Si(质量分数)合金熔体凝固过程中球状颗粒与枝晶间相互作用,以及包含颗粒分布的微观组织形成过程进行了模拟研究.在热、溶质守恒的基础上考虑了溶质再分布、界面曲率以及各向异性的影响,并分别对颗粒、固相、液相以及固/液界面进行处理.建立了单个及多个颗粒与枝晶相互作用的数值模型,预测了单个颗粒与凝固界面之间的吞并/推移现象,并研究了颗粒附近枝晶生长的溶质浓度场、速度场以及界面形状,再现了多颗粒与多枝晶相互作用直至最终偏聚到枝晶间的过程.模拟结果表明:颗粒被推移时颗粒与界面的相互作用是一个非稳态的过程,但是在凝固速率较低的条件下可以按照稳态推移的模式进行处理.模拟得到的颗粒分布及微观组织与实验结果吻合较好.
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