Journal
INTERNATIONAL MATERIALS REVIEWS
Volume 50, Issue 2, Pages 65-82Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/174328005X14294
Keywords
deformation; diffusion; interfaces; grain boundaries; nanostructures
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An overview of theoretical models of plastic deformation and diffusion processes in nanocrystalline (nano-grained) materials is presented. The key experimentally detected facts - abnormal Hall-Petch relationship, anomalously fast diffusion, grain rotations, plastic flow localisation, high-strain-rate superplasticity, etc. - in nanocrystalline materials are discussed. Special attention is paid to theoretical models which describe such plastic deformation mechanisms (modes) as lattice dislocation slip, grain boundary (GB) sliding, GB diffusion creep, triple junction diffusion creep and rotational deformation in nanocrystalline materials with emphasis on competition and interaction between these deformation mechanisms and explanation of the key experimentally detected facts. Theoretical models of diffusion enhancement associated with transformations of GB defects in nanocrystalline materials are also considered.
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