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采用欧拉-欧拉法建立了Al-Pb偏晶合金难混溶区凝固过程弥散相形核、扩散长大、Ostwald熟化、Marangoni迁移等复杂物理过程的数学模型,并以守恒方程为基础建立了弥散相液滴的密度守恒方程以及两相溶质传输方程.结果表明,Al-5Pb偏晶合金相较于Al-10Pb偏晶合金,其组织内部温度场分布均匀、弥散相平均直径较小.分析认为,弥散相含量的降低促使难混溶区液-液相分离和分解速度降低,较易获得弥散相均匀分布的凝固组织.“,”Based on the Euler-Euler method,the mathematical model of complex physical processes such as dispersed phase nucleation,diffusion growth,Ostwald ripening,Marangoni migration,was established,and dispersed phase droplets conservation equation and the density of the two phases based on solute transport equation was described.The results reveal that compared with Al-10Pb monotectic alloy,the microstructure distribution of Al-5Pb monotectic alloy exhibits more uniform,and the average diameter of the dispersed phase is the smaller and volume fraction distribution is more uniform.The decrease of the dispersed phase content leads to the decrease of the liquid-liquid phase separation and decomposition rate in immiscible alloy,and it is easier to obtain a solidified structure in which the dispersed phase is distributed uniformly.