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提出了计算多元合金溶质分凝行为的热力学模型,分析了活度法和浓度法两种计算平衡分凝因数方法的异同,应用提出的模型系统地研究了Al-Cu-Zn合金的平衡分凝因数,计算表明,活度法和浓度法的计算结果接近,溶质Cu和Zn的平衡分凝因数在凝固温度范围内随温度增加下降10％左右,Zn和Cu任何一种溶质元素的浓度增加都会降低另一种元素的平衡分凝因数,同时研究了杂质元素对三元Al-Cu基合金中Cu的平衡分凝固数的影响。
A thermodynamic model for calculating the segregation behavior of solute in multicomponent alloys was proposed. The similarities and differences between the methods for calculating the equilibrium factor for segregation were analyzed by the activity method and the concentration method. The equilibrium segregation of Al-Cu-Zn alloy The calculation shows that the calculated results of the activity method and the concentration method are close to each other. The equilibrium factor of the solute Cu and Zn decreases by about 10% with increasing temperature in the range of the solidification temperature, and the concentration of any solute element of Zn and Cu increases Reduce the balance factor of the other element, and study the effect of impurity elements on the equilibrium solidification number of Cu in the ternary Al-Cu based alloy.