Thermodynamic modeling of ternary alloy phase stability.

摘要

A thermodynamic model based on the Cluster Variation Method (CVM) was developed for the description of solid phases for ternary systems. Emphasis is placed on the characterizations of ternary ordered phases and order-disorder transformations in alloys. The strength of the model consists in its ability to describe long-and short-range order effects in the systems. Thus, the resulting model can describe accurately the individual contributions to the total free energy.;The model is applied to study the gamma (fcc disordered phase) - gamma;The degree of long- and short-range order of the system is a direct output of our final free energy model. It is used to investigate the sublattice site occupation preferences of the constitutent elements in the ternary ordered gamma