On the problem of high-rate reactive diffusion

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Competitive mechanisms for fast diffusional growth of an interphase layer during the initial stage of reactive diffusion were analysed. The effect of fast growth is attributable to grain boundary diffusivity and/or accelerated volume diffusion due to vacancy supersaturation. In analysing the latter case, vacancy source movement and the space distribution of non-equilibrium vacancies were considered. The system parameters which determine the governing mechanism of the process were obtained. It was shown that if, due to vacancy supersaturation, bulk diffusion dominates, the process is intensified by the grain boundary diffusion.