Morphological Stability of Continuous Intergranular Phases

摘要

A thermodynamic analysis of the morphological stability of continuous intergranular phases, incorporating the number of bounding grains n, and dihedral angle psi as variables is presented. For each n, the minimum thermodynamically unstable wavelength of an infinitesimal amplitude perturbation coincides with the Rayleigh result for psi = 180 exp 0 , increases with decreasing psi and tends to infinity as psi approaches pi - (2 pi /n), or equivalently as the interface curvature vanishes. For fixed psi, the stability increases with n. Several applications and implications of the analysis are discussed. (ERA citation 11:001791)