Theory of diffusional phase transformations in nanocrystalline alloys upon severe plastic deformation. III. Alloys with limited solubility

Within the framework of regular solid solution model accounting for variation of diffusion mobility of components a study is made into the effect of a nonequilibrium vacancy flow on decomposition kinetics in the alloy. It is shown that the joint action of thermodynamic stimuli of decomposition kinetics in the alloy. It is shown that the joint action of thermodynamic stimuli of decomposition and inverse Kirkendall effect results in phase precipitates near vacancy sources or sinks even if the parameters of the alloy fall within the range of mutual solubility of components. It is revealed that under certain conditions the attack of vacancy flows may initiate the formation of specific space and time structures (traveling concentration waves). Specific features of decomposition are discussed for alloys under severe plastic deformation when grain boundaries are sources of nonequilibrium vacancies