数值求解了Al-Si共晶定向凝固耦合方程,讨论了凝固界面形态作为共晶相间距函数的变化规律共晶凝固界面临界分叉态对应于边缘稳定点和界面位置的极大值点。α-液相界面临界分叉是局域规则层状结构相间距选择点,而非规则片状结构相间距的选择点对应于β-液相界面临界分叉导出的两种结构的标度律得到了试验测定结果的支持 The eutectic solidification coupling equations of Al-Si eutectic were numerically solved. The variation of solidification interface morphology as a function of eutectic phase spacing was discussed. The critical bifurcation of the eutectic solidification interface corresponds to the maximum point of the edge stability and interface location. The critical bifurcation of the α-liquid interface is the choice of the phase spacing of the local regular layered structure, while the choice of the phase spacing of the irregular sheetlike structure corresponds to the scaling law of the two structures derived from the critical bifurcation of the β-liquid interface Get the test results of the test support