基于相场法对Ni-Cu合金的定向凝固过程进行了数值模拟,对比研究了抽拉速度、温度梯度对有/无强制流动下的凝固界面形貌的影响.结果表明,在强制流动的作用下,凝固界面向迎流方向倾斜生长;随着强制流速的增大,胞晶增大,沟槽的倾斜深度也逐渐增大,并且胞晶间的深度差别增大;在流动条件下,随着抽拉速度的增大,定向凝固界面演变模式为:平界面→深胞→浅胞→平界面,随着温度梯度的增大,凝固界面演化模式为:深胞→浅胞→平界面.此外,流动对凝固形成的胞晶一次间距产生重要影响.
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