No 2, Vol. 1, 2000 
 

EFFECTS OF TRANSFORMATIONS OF GRAIN BOUNDARY DEFECTS
ON DIFFUSION IN NANOCRYSTALLINE MATERIALS

I.A.Ovid'ko 1, A.B. Reizis 1 and R.A. Masumura 2

1 Institute of Problems of Mechanical Engineering, Russian Academy of Sciences,
Bolshoj 61, Vas. Ostrov, St.Petersburg, Russia
2 Naval Research Laboratory Washington DC 20375

Abstract

The specific features of diffusion processes in nanocrystalline materials are discussed. Theoretical models are suggested that describe the effects of transformations (climbing, splitting) of grain boundary dislocations and disclinations on self-diffusion in nanocrystalline materials. It is shown that climbing of grain boundary dislocations strongly enhances diffusion processes in nanocrystalline materials, causing the self diffusion coefficient to be increased by several orders.

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