| Numéro |
J. Phys. Colloques
Volume 51, Numéro C1, Janvier 1990
Proceeding of the International CongressIntergranular and Interphase Boundaries in materials |
|
|---|---|---|
| Page(s) | C1-679 - C1-683 | |
| DOI | https://doi.org/10.1051/jphyscol:19901108 | |
J. Phys. Colloques 51, C1-679-C1-683 (1990)
DOI: 10.1051/jphyscol:19901108
Institute of Metals Superplasticity Problems, URSS Academy of Sciences, Ufa 450001, U. R. S. S.
DOI: 10.1051/jphyscol:19901108
THE DISLOCATION-GRAIN BOUNDARY INTERACTION AND ITS EFFECT ON THE BOUNDARY DYNAMIC PROPERTIES
R.Z. VALIEV et V.Yu. GERTSMANInstitute of Metals Superplasticity Problems, URSS Academy of Sciences, Ufa 450001, U. R. S. S.
Abstract
The problem of the interaction of dislocations with grain boundaries is discussed on the basis of the concept of grain boundary non-equilibrium state generation and recovery. According to this concept, trapped lattice dislocations, being non-equilibrium defects, are absorbed by the boundaries as they dissociate into grain boundary dislocations which are then rearranged into equilibrium configurations. During the absorption of lattice dislocations, grain boundaries are shown to be in an non-stationary, excited state, which causes an abrupt acceleration of some of the grain boundary dynamic process such as diffusion, migration, and sliding.