The method of calculation of formation energies (and characteristics connected with them) for the substitution point defects and vacancies is worked out within the framework of hard-spheres' model. By introducing into consideration the filling numbers for the (HKL)-orientation crystalline planes by different sites of a superlattice, rather simple expressions for the energies of above-mentioned defects' formation are obtained. It is shown that, on average, the attraction of a vacancy to the antiphase boundary takes place. As an example, the numerical calculation is demonstrated for the Fe_3Al alloy with DO_3 superstructure.
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