Journal
ACTA MATERIALIA
Volume 95, Issue -, Pages 176-183Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.05.032
Keywords
Plasticity; Micro-pillars; Dislocation dynamics; Dislocation nucleation
Funding
- US Department of Energy through the DOE EPSCoR Implementation [DE-SC0007074]
- GM-Brown Collaborative Research Laboratory on Computational Materials Science
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-SC0010412, DE-FG02-04ER46163]
- U.S. Department of Energy (DOE) [DE-SC0010412] Funding Source: U.S. Department of Energy (DOE)
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Three dimensional dislocation dynamics (DD) simulations are performed to investigate the governing mechanism of size dependent plastic deformation in submicron face-centered cubic (fcc) micropillars under uniaxial loading. Based on previous atomistic simulations, we introduce an algorithm for dislocation nucleation at the free surface as a function of stress and temperature in the DD simulation. The simulation results show stochastic behaviors in agreement with experimental observations, and reveal that dislocation nucleation at the free surface is the dominant mechanism of plastic flow in small pillars with diameters less than 200 nm, while the operation of truncated dislocation sources is the governing mechanism in large pillars with diameters exceeding 1 mu M. In between, both mechanisms come into play in a stochastic way. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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