INTERFACIAL CHEMISTRY IN SOLIDS

Description of equilibrium grain boundary segregation in multicomponen t systems based on the Guttmann's approach is briefly introduced and t he effects of individual variables (temperature, type and chemical com position of the system, type and structure of the interface) on the le vel of segregation are discussed. A method is outlined which enables p redicting the enthalpy of segregation of individual solutes at individ ual main boundaries in a chosen matrix an the basis of the solid solub ility data (grain boundary segregation diagrams). The relationship bet ween segregation enthalpy and entropy is suggested. The change of the cohesion energy induced by the grain boundary segregation can serve fo r example of its influence on other properties of the material.