Strain rate effects in the ultrafine grain and nanocrystalline regimes—influence on some constitutive responses |
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Authors: | Q Wei |
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Affiliation: | (1) Department of Mechanical Engineering and Engineering Science, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223-0001, USA |
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Abstract: | Mounting evidence is pointing to some emerging novel behaviors of metals with ultrafine-grain (UFG) and/or nanocrystalline
(NC) microstructures. One such novel behavior is related to the thermodynamic and kinetic aspects of plastic response in the
UFG/NC regime. Two inter-related parameters, viz., the strain rate sensitivity (SRS) and the activation volumes of plastic
deformation, are used as fingerprints for the thermodynamics and kinetics of plastic deformation. Changes of these parameters
with grain size may indicate transition of plastic deformation mechanisms. Therefore, investigations of these phenomena may
bring out new strategies for ingenious design and synthesis of UFG/NC materials with desirable properties. In this article,
we present a critical review on the experimental results and theories associated with the SRS of UFG/NC metals with different
lattice structures, and the influences on some constitutive responses. |
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