The size effects upon shock plastic compression of nanocrystals

For the first time a theoretical analysis of scale effects upon the shock plastic compression of nanocrystals is implemented in the context of a dislocation kinetic approach based on the equations and relationships of dislocation kinetics. The yield point of crystals τ y is established as a quantita...

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Bibliographic Details
Published in:Physics of the solid state 2017-10, Vol.59 (10), p.1987-1992
Main Authors: Malygin, G. A., Klyavin, O. V.
Format: Article
Language:English
Subjects:
Deformation
Dislocations
Mechanical Properties
Nanocrystals
Physics
Physics and Astronomy
Physics of Strength
Plasticity
Size effects
Solid State Physics
Stress relaxation
Yield point
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Summary:For the first time a theoretical analysis of scale effects upon the shock plastic compression of nanocrystals is implemented in the context of a dislocation kinetic approach based on the equations and relationships of dislocation kinetics. The yield point of crystals τ y is established as a quantitative function of their cross-section size D and the rate of shock deformation as τ y ~ ε 2/3 D . This dependence is valid in the case of elastic stress relaxation on account of emission of dislocations from single-pole Frank–Read sources near the crystal surface.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783417100262