Article ID Journal Published Year Pages File Type
1498713 Scripta Materialia 2013 4 Pages PDF
Abstract

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.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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