Abstract
Nanocrystalline materials have been characterized by ultra-fine crystallites separated by grain boundaries. The dislocations in the crystallites of nanocrystalline materials form some special configurations and the dislocation density drastically decreases. A model is proposed to account for the effects of the defects in the grain boundaries of nanocrystalline materials on the dislocation stability and configuration in the crystallites. Based on the fact that the grain boundaries of nanocrystalline materials contain a large number of vacancies and vacancy clusters, a 1/x3 law for the stress field induced by the vacancies and the vacancy clusters is considered. The region of the dislocation stability in the crystallites is estimated and the dislocation configurations in the crystallites are discussed. The theoretical results are shown to interpret the experimental observations well.
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