微量元素在Ni基合金凝固过程中分配行为的模拟

FRUITION BEHAVIOR SIMULATIONS OF MINOR ELEMENTS DURING Ni-BASED ALLOY SOLIDIFICATION

以多元合金系在凝固过程中组元满足的液固界面平衡方程，即组元在液固相中的化学位相等为基础建立了一个反映多元系凝固偏析的简易模型，利用它对多元合金系凝固初期的特征进行了定性描述，并且对某些微量元素在Ｎｉ基合金凝固过程中的分配行为进行了计算模拟，得到的结果与实验结果较好地相符．从定性说明和计算模拟的角度，方便地确定出对Ｎｉ基合金凝固偏析起决定性作用的微量元素。

Based on the interface equilibrium equation that each component must satisfy in the multicomponent alloy solidification, namely the chemical potentials of each component are equal in liquid state and solid state, a simple model that reflects the solidification segregation of multicom- ponent alloy is provided. With it, the characters of primary solidification of multicomponent alloy are described qualitatively and the partition behaviors of some minor elements in Ni-base alloy solid- ification are computed and simulated. The results obtained correspond with the experiment. From qualitative demonstration and computational simulation, the minor element has the main action in the solidification segregation of Ni-base alloy can be conveniently determined.