Energies of formation and activation for migration of grain-boundary vacancies in a nickel bicrystal containing a disclination

被引：5
作者：
Murzaev, R. T.
Nazarov, A. A.
机构：
[1] Russian Acad Sci, Inst Problems Met Superplast, Ufa 450001, Bashkortostan, Russia
[2] Ufa State Tech Univ Aviat, Ufa 450000, Bashkortostan, Russia
来源：
PHYSICS OF METALS AND METALLOGRAPHY | 2006年 / 102卷 / 02期
关键词：
D O I：
10.1134/S0031918X06080114
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The energies of formation and activation for migration of vacancies in the [001] tilt boundary containing a wedge disclination have been calculated with the help of atomistic computer simulation using a multiparticle interatomic potential based on the embedded-atom method. The Sigma = 5 (310) theta = 53.13 degrees tilt boundary that contains a negative disclination of strength omega = -4.98 degrees and a positive disclination of strength omega = 5.21 degrees has been investigated. It has been shown that high internal disclination-induced stresses exert a very strong effect on the diffusion coefficient. In the region of about 5 nm around the disclination core, the energy characteristics of vacancies may differ markedly from those typical of a defect-free boundary.
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页码：198 / 204
页数：7
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