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  Strain rate dependency of dislocation plasticity

Fan, H., Wang, Q., El-Awady, J. A., Raabe, D., & Zaiser, M. (2021). Strain rate dependency of dislocation plasticity. Nature Communications, 12(1): 1845. doi:10.1038/s41467-021-21939-1.

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Strain rate dependency of dislocation plasticity - s41467-021-21939-1.pdf (Publisher version), 5MB
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Strain rate dependency of dislocation plasticity - s41467-021-21939-1.pdf
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The Author(s), corrected publication 2021

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 Creators:
Fan, Haidong1, 2, Author              
Wang, Qingyuan3, Author
El-Awady, Jaafar A.4, Author              
Raabe, Dierk1, Author              
Zaiser, Michael5, Author
Affiliations:
1Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
2Key Laboratory of Energy Engineering Safety and Disaster Mechanics (Ministry of Education), Department of Mechanics, Sichuan University, Chengdu, China, ou_persistent22              
3Department of Mechanics, Sichuan University, Chengdu, China, ou_persistent22              
4Department of Mechanical Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, MD, USA, ou_persistent22              
5WW8-Materials Simulation, Department of Materials Science, FAU Universität Erlangen-Nürnberg, Fürth, Germany, ou_persistent22              

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Free keywords: aluminum; density dependence; hardening; molecular analysis; plasticity; strain rate
 Abstract: Dislocation glide is a general deformation mode, governing the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain rate and dislocation density dependence of the strength of bulk copper and aluminum single crystals. An analytical relationship between material strength, dislocation density, strain rate and dislocation mobility is proposed, which agrees well with current simulations and published experiments. Results show that material strength displays a decreasing regime (strain rate hardening) and then increasing regime (classical forest hardening) as the dislocation density increases. Accordingly, the strength displays universally, as the strain rate increases, a strain rate-independent regime followed by a strain rate hardening regime. All results are captured by a single scaling function, which relates the scaled strength to a coupling parameter between dislocation density and strain rate. Such coupling parameter also controls the localization of plasticity, fluctuations of dislocation flow and distribution of dislocation velocity. © 2021, The Author(s).

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 Dates: 2021-03-23
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41467-021-21939-1
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 (1) Sequence Number: 1845 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723