In describing the void swelling of metals and alloys, the rate theory based on the “effective medium” model is widely used. This approach does not seem to be closed since the size of the influence region remains an unspecified parameter of the theory and as a rule is assumed to be equal to the average distance between sinks. We suggest another approach, which is essentially an extension of the self-consistent field approximation to the array of finite-size particles. The closed set of equations is formulated to find the fluxes of point defects to sinks (voids and second-phase precipitates). Within the scope of this approach, the analytical expressions for growth rate of spherical macrodefects, taking into account the boundary kinetics as well as the elastic interaction between point defects and sinks, are obtained. Our model can be applied to describing the diffusion evolution of macrodefects under conditions of both high-temperature annealing and irradiation.
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