Thermodynamics of the formation of nanoprecipitates of the second phases with an extended interface

A model of phase equilibrium in alloys containing nanoprecipitates of the second phases has been developed taking into account the extension (length) of the interface between the phases. Relationships have been obtained for calculating the dependences of equilibrium compositions of conjugate phases and the width of the transition layer between the phases on the precipitate size. It has been shown using binary alloys as an example that a decrease in the precipitate size leads to a mutual enrichment of the conjugate phases with atoms of the dissolved component (solute) and to a decrease in the width of the transition layer between the phases.