Interfacial stress, interfacial energy, and phase equilibria in binary alloys

A simple model is presented in order to explore the influence of interfacia l stress, interfacial energy, and surface stress on the characteristics of phase equilibria in stressed, two-phase binary alloys. Two different system geometries are employed: concentric spheres and thin plates. The condition s for thermodynamic equilibrium are solved and equations of state for each geometry are obtained in terms of the phase fraction, alloy composition, sy stem dimension, and several dimensionless materials parameters. Elastic str ess introduces new equilibrium states that are further modified by the inte rfacial quantities. Those conditions for which interfacial quantities can i nduce significant changes in the equilibrium phase fraction and phase compo sitions are identified.