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采用耦合溶质场的相场模型模拟了亚共晶Al-2mol%Si二元合金枝晶生长过程,研究了不同过冷度条件下枝晶的生长形貌以及沿生长方向溶质浓度的分布情况,同时分析了固相溶质扩散系数对微观偏析的影响。结果表明:过冷度对溶质的分布有较大影响,过冷度的增加使凝固界面溶质的富集程度增大;增大固相溶质扩散系数,溶质的微观偏析程度减轻;计算结果与Ivantsov理论值能够较好的吻合。
The phase field model of the coupled solute field was used to simulate the growth of dendritic Al-2mol% Si binary alloy. The growth morphology and the distribution of solute concentration along the growth direction under different undercooling conditions were studied. The effect of solid solute diffusion coefficient on microsegregation was analyzed. The results show that the degree of undercooling has a significant effect on the solute distribution. The increase of the degree of supercooling increases the solute enrichment at the solidification interface. When the solute diffusion coefficient increases, the degree of solute microsegregation decreases. The calculated results are in agreement with Ivantsov The theoretical value can be better matched.