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Институт Проблем Машиноведения РАН ( ИПМаш РАН ) Институт Проблем Машиноведения РАН ( ИПМаш РАН )

МИНОБРНАУКИ РОССИИ
Федеральное государственное бюджетное учреждение науки
Институт проблем машиноведения Российской академии наук

МИНОБРНАУКИ РОССИИ
Федеральное государственное бюджетное учреждение науки
Институт проблем машиноведения Российской академии наук

Analysis of the conditions of crack nucleation during lattice dislocations transition through grain boundary

Авторы:
V.N. Perevesentsev , S.V. Kirikov , N.Yu. Zolotorevsky ,
Страницы:
173-181
ДОИ (doi):
Аннотация:

The formation of deformation facets at high-angle grain boundaries during their interaction with lattice dislocation pile-ups is accompanied by the appearance of wedge disclination dipoles disposed on the plane of the facets. Their elastic energy increases as the dislocations of pile-up penetrate the grain boundary and the deformation facet lengthens. A possibility was considered for the relaxation of elastic energy of the disclination dipole and the pile-up stored in the vicinity of the facet. A concept of the least possible length of the crack in a crystalline solid was introduced, and an energetic criterion of its nucleation was suggested. An analysis of conditions for the crack nucleation in configuration space of considered system parameters – the total Burgers vector of pile-up, the strength of disclination dipoles, and the value of external load – has been carried out.

Файл (pdf):
18:43
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