A simple and general theory was developed in order to predict the orientation relationship, orientation, structure and migration mechanisms of planar interphase boundaries in phase transformations. Unlike existing theories, that were based essentially upon the matching of atoms or lattice sites within 2 parallel closely-packed planes in the 2 lattices, the present theory involved consideration of the matching of edges of closely-packed lattice planes. Planar interphase boundaries were defined by the moiré plane which resulted from intersection between at least 2 sets of closely-packed lattice planes. Such boundaries migrated in their normal directions by successive nucleation and lateral gliding, within the macroscopic interphase planes, of interfacial defects of moiré ledges that had unique heights and displacement vectors.

Crystallography and Migration Mechanisms of Planar Interphase Boundaries. J.F.Nie: Acta Materialia, 2004, 52[3], 795-807