建立了模拟二元合金树枝晶生长的三维元胞自动机模型,以Al-4％Cu(质量分数)为模型合金,模拟了合金过冷熔体中树枝晶的生长过程,研究了来流对枝晶生长的影响.结果表明,来流对合金过冷熔体中三维树枝晶生长影响显著,迎流侧枝晶尖端生长速度随来流速度的增大而增大,枝晶尖端半径随来流速度的增大而减小；随着来流速度的增大,枝晶尖端选择参数减小；在给定过冷度条件下,随界面能各向异性的增大,来流对枝晶尖端选择参数的影响增强；对于给定的合金(或界面能各向异性),来流对枝晶尖端选择参数的影响随着过冷度的增大而增强.
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