Surface evolution in two-component system Original Research Article

Mullins’ theory of capillary driven shape evolution in solid was extended for two-component systems, taking into account the difference in mobility of the components in the surface layer. A close set of equations describing evolution of both surface profile and surface composition was derived. The developed theory was applied for two problems: (i) grain boundary grooving; (ii) flattening of periodically corrugated surfaces. The main result is the formation of concentration inhomogeneity on the surface and in the bulk beneath the surface during a capillary driven shape change of the surface.