采用耦合溶质场、温度场和流场的相场模型,对Ni-Cu合金凝固过程中多枝晶生长进行模拟,研究了多枝晶生长形貌及温度场和溶质场分布.结果表明:熔体流动显著改变凝固前沿的传热和传质,从而影响枝晶生长.受过冷熔体冲刷,枝晶逆流侧前沿溶质浓度和温度低,枝晶臂尖端生长迅速；枝晶顺流侧前沿溶质浓度和温度高,枝晶臂尖端生长缓慢.在熔体流动和多枝晶之间相互影响下,枝晶呈现非对称生长.此外,熔体流动改变非流动方向枝晶臂的优先生长方向,使其向逆流方向倾斜.
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