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金属学报  2001 

过偏晶合金快速凝固过程中第二相液滴在液-液相变区内的粗化

, PP. 363-368

Keywords: 难混溶合金,第二相粗化,数学模型

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Abstract:

建立了一个描述快速冷却条件下偏晶合金在液-液相变区内的第二相液滴粗化的数学模型.该模型考虑了第二相液滴的形核、扩散长大以及Brownian碰撞三者的共同作用.模拟结果表明,第二相液滴间的Brownian碰撞是影响液滴粗化的一个重要的因素.快的冷却速率导致基体液相中溶质过饱和度和第二相形核速率都升高到一个高的水平,同时得到较小的液滴平均半径和较大的液滴数目密度.这个模型对Al-30%In合金的预测结果与实验结果吻合较好.这说明本文所建立的模型在快速冷却条件下具有实际预测功能.这个模型同样可用于其它难混溶合金系.

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