Atomic mechanism of diffusion over low-angle twist boundaries in FCC metals

A.N. Martynov1, G.M. Poletaev1, M.D. Starostenkov1*
1Altai State Technical University, Lenin st. 46, 656038 Barnaul
Abstract
The atomic mechanism of diffusion over low-angle twist boundaries (100), (110), (111) in fcc metals Ni, Cu, Al is studied by the method of molecular dynamics. It was shown that self-diffusion over twist grain boundaries took place by the formation of the chains of displaced atoms along the nuclei of screw grain boundary dislocations, initiated, as a rule, near knots of dislocation net. 
Received: 03 February 2011   Revised: 06 March 2011   Accepted: 23 March 2011
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