Abstract
Phase stability in a substitutional binary alloy with a high concentration of vacancies were studied by a Monte Carlo method in consideration of the role of vacancies. It is assumed that excess vacancies introduced by irradiation play a role in the radiation induced spinodal decomposition. The values of pairwise interaction energy parameters used here were determined by a quasi-equilibrium approximation in such a way that they elevated the spinodal temperature with increase of vacancy concentration in a pseudo-ternary alloy with the vacancies regarded as the third element.As a result, the elevation of spinodal temperature were obtained when the ordering energy parameters between vacancy and other atoms were negative.
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