对Al-Bi基难混溶合金添加第三组元Si和Cu,揭示了Si和Cu含量对Al-Bi合金快速定向凝固组织的影响.结果表明,添加Si或Cu均使凝固组织中的富Bi粒子尺寸增大;在相同的实验条件下,元素Si比Cu更易使富Bi相粗化.分析了第三组元对二元合金体系的自由能、两液相间界面能和液相粘度的改变及其对合金凝固过程的影响,加深了对三元难混溶合金凝固特征的认识.
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