Deformation and Diffusion Modes in Nanocrystalline Materials

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-rat...

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Bibliographic Details
Published inInternational materials reviews Vol. 50; no. 2; pp. 65 - 82
Main Author Ovid'ko, I.A.
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 02.03.2005
SAGE Publications
Subjects
DEFORMATION
DIFFUSION
GRAIN BOUNDARIES
INTERFACES
NANOSTRUCTURES
INTERFACES
DIFFUSION
NANOSTRUCTURES
DEFORMATION
GRAIN BOUNDARIES
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0950-6608
1743-2804
DOI:10.1179/174328005X14294