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Title: Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires

Abstract

Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain. While dislocation activities in a localized region give rise to an initially thin shear band, self-catalyzed stress concentration and dislocation nucleation at shear band interfaces cause a discrete thickening of shear band. Our findings not only advance the current understanding of defect activities and deformation morphology of BCC nanowires, but also shed light on the deformation dynamics in other microscopic crystals where jerky motion of deformation band is observed.

Authors:
 [1];  [2];  [3];  [1];  [1];  [4]
  1. Zhejiang Univ., Hangzhou (China).
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Stanford Univ., CA (United States)
  3. Stanford Univ., CA (United States)
  4. Univ. of Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Leland Stanford Junior Univ., Stanford, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1500035
Grant/Contract Number:  
SC0010412
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, and Mao, Scott X. Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires. United States: N. p., 2018. Web. doi:10.1038/s41598-018-23015-z.
Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, & Mao, Scott X. Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires. United States. doi:10.1038/s41598-018-23015-z.
Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, and Mao, Scott X. Thu . "Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires". United States. doi:10.1038/s41598-018-23015-z. https://www.osti.gov/servlets/purl/1500035.
@article{osti_1500035,
title = {Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires},
author = {Wang, Jiangwei and Wang, Yanming and Cai, Wei and Li, Jixue and Zhang, Ze and Mao, Scott X.},
abstractNote = {Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain. While dislocation activities in a localized region give rise to an initially thin shear band, self-catalyzed stress concentration and dislocation nucleation at shear band interfaces cause a discrete thickening of shear band. Our findings not only advance the current understanding of defect activities and deformation morphology of BCC nanowires, but also shed light on the deformation dynamics in other microscopic crystals where jerky motion of deformation band is observed.},
doi = {10.1038/s41598-018-23015-z},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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