Abstract:
A model has been developed for nucleation and growth of particles of the second phase in alloys based on the Fe–Cr system. It has been assumed that the main mechanisms of change in the distribution of phases in the alloy are the fluctuation activationless nucleation of clusters enriched with chromium and their subsequent growth due to the diffusion of chromium atoms. The model is applied to the description of the growth kinetics of particles of the second phase in the alloy Fe–$x$Cr ($x$ = 14, 16, 18, 20 at%) at the temperature $T$ = 500$^\circ$C. The obtained values of the diffusion coefficient $D_{Cr}$ = 3.12 $\times$ 10$^{-19}$ cm$^2$/s and the rate of fluctuation nucleation (decomposition) of the clusters $\tau^{-1}$ = 0.868 $\times$ 10$^{-3}$ s$^{-1}$ are consistent with the data available in the literature.
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