INSTABILITY ORIGIN OF DISLOCATION SUBSTRUCTURE

The formation of a dislocation substructure in high-temperature deformation is treated as a stability problem. A crystal in which dislocations can glide and climb is modelled as an anisotropic viscous medium. The subgrain structure development is interpreted as a deformation-induced instability of internal bending (folding) type first described by Biot. The suggested continuum mechanics model seems to provide a rational explanation of the main observed features of the subgrain structure: misorientation, tendency to regularity and relatively uniform subgrain size. © 1990 Taylor & Francis Group, LLC.