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从热力学角度分析了三元合金凝固过程中的溶质分凝行为 ,利用耦合热力学计算技术研究了Al Si Mg三元合金溶质分凝因数在凝固过程中的变化规律 ,获得了其与固相体积分数的定量关系 ,进而预测了不同条件下Al Si Mg三元合金的凝固过程和相析出规律。实验发现三元合金中溶质分凝因数在凝固过程变化巨大 ,采用二元系中的参数使得对共晶种类和共晶分数的预测均与实验值有较大偏差。采用耦合热力学计算技术 ,获得了分凝因数在凝固过程中的变化规律 ,使预测值更好地吻合于实验结果。
From the thermodynamic point of view, the segregation behavior of solute during the solidification of ternary alloys was analyzed. The variation law of solute segregation factor of Al Si Mg ternary alloy during solidification was studied by using the coupled thermodynamic calculation technique. , And then predicted the solidification process and phase precipitation regularity of Al Si Mg ternary alloy under different conditions. The experimental results show that the solute segregation factor in the ternary alloy varies greatly during solidification. The parameters of the binary system make the prediction of eutectic species and eutectic fraction deviate significantly from the experimental values. The coupled thermodynamic calculation technique was used to obtain the variation rule of the segregation factor in the process of solidification, so that the predicted values fit well with the experimental results.