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Intrinsic size dependent plasticity in BCC micro-pillars under uniaxial tension and pure torsion

Cited 10 time in Web of Science Cited 14 time in Scopus
Authors

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

Issue Date
2020-10
Publisher
ELSEVIER
Citation
EXTREME MECHANICS LETTERS, Vol.40
Abstract
The mechanical behavior of submicron body-centered cubic (BCC) micro-pillars is investigated by three-dimensional dislocation dynamics (DD) simulations to better understand the governing mechanisms for size dependent plasticity under uniaxial tension and pure torsion. A formula is developed to compute the incremental plastic twist due to dislocation motion in DD simulations. The DD simulations show that different dislocation microstructures are created depending on the loading conditions, which leads to different size dependent mechanical behavior. While in tension plasticity is mainly governed by the kinetics of dislocation motion controlled partly by the surface dislocation sources, plastic flow in torsion is controlled by dislocation pile-ups associated with strain gradients. The simulation results also reveal a Bauschinger effect and plastic recovery under cyclic twist, which have been observed in recent experiments. (C) 2020 Elsevier Ltd. All rights reserved.
ISSN
2352-4316
URI
https://hdl.handle.net/10371/201260
DOI
https://doi.org/10.1016/j.eml.2020.100901
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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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