Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 2013 | public
Journal Article

Small-scale plasticity: Insights into dislocation avalanche velocities

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.

Additional Information

© 2013 Acta Materialia Inc. Published by Elsevier Ltd. Received 6 May 2013; revised 2 July 2013; accepted 3 July 2013. Available online 15 July 2013. R.M. gratefully acknowledges the financial support of the Alexander von Humboldt foundation, and his host G.M. Pharr for valuable discussions. J.R.G. is thankful for the financial support of the Office of Naval Research (ONR Grant N000140910883).

Additional details

Created:
August 22, 2023
Modified:
October 25, 2023