Abstract
The thermodynamics of vacancies in substitutional ternary alloys has been treated using the model of nearest-neighbor pair approximation. One modification incorporated in the model is the consideration of not only the bond energies between atoms, but also the apparent binding energies of vacancy-vacancy and vacancy-atom pairs. An expression for the equilibrium concentration of divacancies is obtained and it differs from the existing expression by a factor which depends on the vacancy concentration. The equilibrium concentration of vacancies is obtained for dilute solutions and compared with the previous results for binary alloys. The introduction of the apparent binding energies facilitates the interpretation of results. It is particularly true in the case that the interactions between solute atoms and vacancies are the main concern.
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