New expression for property difference in components for the Unified Extrapolation Model

Abstract

As an important method to estimate the thermodynamic properties of a multi-component system from the sub-binary systems, many extrapolation models have been proposed in the past. However, lacking a clear rule to distinguish the applicability leads to much confusion in practice. Recently, a Unified Extrapolation Model (UEM) that can cover all traditional extrapolation models was built by introducing a contribution coefficient which depends on the property difference between two components in a multi-component system. In this paper, the definition of property difference between any two components was discussed and presented a new mathematical expression to describe it. The performance of the new mathematical expression was tested for prediction of the mixing enthalpy in multicomponent alloy systems. The results revealed that the new mathematical expression for the property difference between components makes the performance of the UEM stand out among all traditional extrapolation models.