ABSTRACT

The excess free energies of sub-binary Al–Sn, Sn–Zn and Zn–Al alloys and ternary Al–Sn–Zn alloy were computed using the optimised exponential parameters of R–K polynomial at 973, 1073, 1173 and 1273 K. The computed values of free energy of mixing, enthalpy of mixing and activity of the ternary alloy were compared with the available experimental data. The surface concentrations of the monomers of the ternary Al–Sn–Zn alloy were computed using Butler model. The surface tension of the ternary liquid alloy was calculated in the framework of Chou, Kohler, Toop and Bulter models using optimised parameters for the excess surface tension. The viscosity of the sub-binary systems have been computed using Kaptay equation with the help of calculated results of enthalpy of mixing, and the viscosity of the ternary alloy were computed in the framework of Chou, Kohler and Toop model using optimised parameter for the excess viscosity.

摘要

使用优化的R-K多项式的指数参数在973、1073、1173和1273 K下计算了亚二元Al-Sn，Sn-Zn和Zn-Al合金以及三元Al-Sn-Zn合金的过剩自由能。将混合自由能，混合焓和三元合金活性的计算值与现有的实验数据进行了比较。使用Butler模型计算Al-Sn-Zn三元合金单体的表面浓度。三元液态合金的表面张力是在Chou，Kohler，Toop和Bulter模型的框架内使用过剩表面张力的优化参数来计算的。借助混合焓的计算结果，使用Kaptay方程计算了二元体系的粘度，并在Chou的框架下计算了三元合金的粘度，