Low energy dislocation structures caused by phase transformation

Abstract

A review of the theory of Frank and van der Merwe applicable to phase transformations in a variety of systems is presented. This theory recognizes the lattice periodicity by employing an interfacial periodic interaction potential. The two primary defects at interphase boundaries are shown to be lattice-strain- and misfit-compensating dislocations. Although the theory was developed for thin films, its applicability to phase transformations in bulk materials is demonstrated. A comprehensive review of experimental results of interphase structure in various phase transformations follows. The review covers precipitation in metals, ceramics and minerals, directional solidification, lamellar solid-solid phase transformations, and spinodal and martensitic transformations. All these contain a low energy interfacial dislocation structure at partially coherent interphase boundaries.