对在不同电流密度的直流电场作用下Al-4.5%Cu合金定向凝固组织的变化进行了研究.结果表明,电流有促进Al-4.5%Cu合金定向凝固柱状枝晶生长的倾向.随着电流密度的增大,定向凝固的枝晶组织中二次枝晶明显细化,θ(CuAl2)相含量进一步增加.结合电流对凝固过程中固-液界面温度梯度和溶质再分配的影响,对实验结果进行了分析.
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