Thermodynamic modeling of the Fe-Zn system using exponential temperature dependence for the excess gibbs energy

Abstract

The Fe-Zn binary system was re-modeled using exponential equation to describe the excess Gibbs energy of the solution phases and intermetallic compouds with large homogeneities. A self-consistent set of thermodynamic parameters is obtained and he calculated phase diagrams and thermodynamic properties using the exponential equation agre well with the experimental data. Compared with previous assessments using the linear equation (Li = hi - si · T) to describe the interaction parameters, the artificial miscibility gap at high temperature was removed. In addition, the calculated thermodynamic properties of the liquid phase were more rasonable than those resulting from all the previous calculations. The present calculations yield noticeable improvements to the previous calculations. © Journal of Mining and Metallurgy.