Continuum theory of interfacial segregation
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چکیده
Theoretical work in the field of interfacial segregation is mainly focused on the Gibbsian approach that uses the dividing surface construct. In this article a continuum approach to the problem of interfacial segregation in multicomponent hydrostatically compressed alloys is developed and the segregation at homophase and heterophase interfaces is considered on common grounds. The Gibbs adsorption theorem is derived in the framework of an isoperimetric problem, and a comparison is made with the dividing surface construct approach. The interfacial segregation is calculated for the case of a linear thermodynamic system where it is found to vanish at a heterophase interface and have a critical dependence on the temperature and composition at a homophase interface. The physical driving force for the interfacial segregation is discussed.
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تاریخ انتشار 2001