Journal
SCRIPTA MATERIALIA
Volume 69, Issue 8, Pages 586-589Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.07.005
Keywords
Plasticity; Dislocations; Micromechanics; Size effect
Categories
Funding
- Alexander von Humboldt foundation
- Office of Naval Research (ONR) [N000140910883]
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We report direct measurements of displacement jump velocities in deforming nano- and microcrystals. These velocities exhibit large scatter and no correlation with plastic strain, crystal size or applied stress. Statistical analysis for the displacement jump velocities shows a cubic power-law decay, with a shoulder at low velocities. Our results indicate that the collective motion of dislocations in the deforming crystals is dominated by statistical fluctuations within the internal stresses, rather than by a mobility law that depends on the externally applied stress. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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