Abstract
The earlier-developed statistical methods for nonequilibrium alloys are generalized to stochastically describe the evolution of microstructure at the first stages of phase separation in alloys. An important parameter of the theory is the size of locally equilibrated regions, which is estimated by using simulations at different values of this parameter. The approach is used to study the microstructural features of both the nucleation and growth (NG) and the spinodal decomposition (SD) types of evolution, as well as the morphological transition NG-SD under variations of $c$ and $T$ across the spinodal curve. We also investigate morphology of precipitates and kinetic features of precipitation at low temperatures. The results obtained agree well with the available experimental observations and Monte Carlo simulations.
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