Progress Report on Recent Advances in Physical Metallurgy: (B) Dislocation Morphology

Abstract

The atomic structures of individual dislocations, the shapes adopted by isolated dislocation lines and loops, and the arrangement of groups of dislocations in networks, pile-ups, or multipoles may all be regarded as different aspects of dislocation morphology. Experimental information on these topics is largely obtained from transmission electron microscopy, supplemented by field-ion microscopy when the atomic configuration is being considered and by X-ray microscopy and etch-pitting techniques when dislocation arrangements are being investigated. Theoretical calculations are also important, and attention has recently been concentrated on problems in which either the elastic anisotropy or the core energy is significant.