Computer Simulation of Phase Decomposition in the Regular Solid Solution based upon the Cahn-Hilliard’s Non-Linear Diffusion Equation

Abstract

A new Fourier expression of the Cahn-Hilliard’s flux equation is proposed, where the regular solution approximation is adopted as the chemical free energy of solid solution and the mobility of atoms is defined as a function of solute composition. The computer simulations of phase decomposition are successfully performed on the basis of the new method. This calculation method is applicable for the phase decompositions in the actual alloy systems, because the thermodynamical characteristics of the alloys have usually been evaluated on the basis of the regular solution model or the modified regular solution model.