SCREENING OF DISCLINATIONS STRESS FIELDS BY DISLOCATION ENSEMBLE AND NUCLEATION OF MISORIENTED STRUCTURES DURING PLASTIC DEFORMATION |
| 5 | |
| 2010 |
| INVESTIGATION OF THE PHYSICAL NATURE OF MATERIAL FRAGMENTATION |
| scientific article | 539.4 | ||
| 82-90 | dislocations, disclinations, mesodefects, broken boundaries, fragmentation, screening, elastic energy, misoriented regions |
| A kinetic approach has been developed to the description of formation of misoriented crystal regions close to disclinations.
An analytical study has been carried out of dislocation ensemble self-consistent dynamics in the field of
mesodefects (wedge disclination and disclination dipole). The coordinate dependences of stress tensor components of
the screened disclination systems considered have been found. Mesodefects in the plastic zone have been shown to
give rise to stratification of a homogeneous dislocation flow and to form regions with enhanced dislocation charge
density. Such a redistribution of dislocations effectively screens elastic fields of mesodefects, substantially lowers the
system energy and creates prerequisites for misoriented regions - broken subboundaries along extremum lines of the
dislocation charge. |
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