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Stochastic behaviors in plastic deformation of face-centered cubic micropillars governed by surface nucleation and truncated source operation

Cited 42 time in Web of Science Cited 51 time in Scopus
Authors

Ryu, Ill; Cai, Wei; Nix, William D.; Gao, Huajian

Issue Date
2015-08
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, Vol.95, pp.176-183
Abstract
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.
ISSN
1359-6454
URI
https://hdl.handle.net/10371/201265
DOI
https://doi.org/10.1016/j.actamat.2015.05.032
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Ryu, Ill류일
조교수
  • College of Engineering
  • Department of Materials Science & Engineering
Research Area Fundamental deformation mechanisms, Optimal desing in nanostructures, Reliability Analysis in Nanostructures

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