Estimation of Viscosity of Alloys Using Gibbs Free Energy of Mixing and Geometric Model

Abstract: In the present work, using mixing Gibbs free energies and Chou’s general solution model (GSM), by considering the excess activation energies from the binary subsystems, the viscosities of the simple ternary Au–Ag–Cu, Al–Cu–Si, and Fe–Ni–Co and liquid alloys of binary subsystems have been evaluated via well known Chou model and physical models, such as Kaptay, Kozlov–Romanov–Petrov (KRP), and Schick et al. at temperatures 1373, 1375, and 1873 K. A comparison between the evaluated results and experimental values of the Au–Ag–Cu, Al–Cu–Si, and Fe–Ni–Co ternary alloys was carried out. In this study, the success of the application of the aforementioned geometric and physical models to the viscosity calculations of the alloys discussed and the viscosite data are presented to the literature. In order to determine the applicability success, the mean square deviation analysis was performed. According to the values in this table, Schick et al. and KRP models which are derived from the physical quantities among the models discussed provide best description of the viscosity for the Al–Cu–Si and Au–Ag–Cu alloys, respectively.