Hypothesis of a Weak Nonlocality for Determining the Binodal of a Binary Alloy

Abstract

This work proposes an approach for the calculation of equilibrium solubility limits in binary alloys, which is an alternative to approaches based on gradient expansions. The proposed approach rests on the description of alloys in terms of a weak nonlocality, which generalizes the classical local equilibrium hypothesis. This results in a theory that can be used to derive the explicit concentration dependence of all used parameters solely from knowledge of the concentration dependence of free energy density, which is impossible within the framework of existing approaches.