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The origin of jerky dislocation motion in high-entropy alloys

Author

Listed:
  • Daniel Utt

    (Technische Universität Darmstadt)

  • Subin Lee

    (Max-Planck-Institut für Eisenforschung GmbH
    Institute for Basic Science
    Institute for Applied Materials, Karlsruhe Institute of Technology)

  • Yaolong Xing

    (Sungkyunkwan University)

  • Hyejin Jeong

    (Sungkyunkwan University)

  • Alexander Stukowski

    (Technische Universität Darmstadt)

  • Sang Ho Oh

    (Sungkyunkwan University
    Korea Institute of Energy Technology (KENTECH))

  • Gerhard Dehm

    (Max-Planck-Institut für Eisenforschung GmbH)

  • Karsten Albe

    (Technische Universität Darmstadt)

Abstract

Dislocations in single-phase concentrated random alloys, including high-entropy alloys (HEAs), repeatedly encounter pinning during glide, resulting in jerky dislocation motion. While solute-dislocation interaction is well understood in conventional alloys, the origin of individual pinning points in concentrated random alloys is a matter of debate. In this work, we investigate the origin of dislocation pinning in the CoCrFeMnNi HEA. In-situ transmission electron microscopy studies reveal wavy dislocation lines and a jagged glide motion under external loading, even though no segregation or clustering is found around Shockley partial dislocations. Atomistic simulations reproduce the jerky dislocation motion and link the repeated pinning to local fluctuations in the Peierls friction. We demonstrate that the density of high local Peierls friction is proportional to the critical stress required for dislocation glide and the dislocation mobility.

Suggested Citation

  • Daniel Utt & Subin Lee & Yaolong Xing & Hyejin Jeong & Alexander Stukowski & Sang Ho Oh & Gerhard Dehm & Karsten Albe, 2022. "The origin of jerky dislocation motion in high-entropy alloys," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32134-1
    DOI: 10.1038/s41467-022-32134-1
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    References listed on IDEAS

    as
    1. Ruopeng Zhang & Shiteng Zhao & Jun Ding & Yan Chong & Tao Jia & Colin Ophus & Mark Asta & Robert O. Ritchie & Andrew M. Minor, 2020. "Short-range order and its impact on the CrCoNi medium-entropy alloy," Nature, Nature, vol. 581(7808), pages 283-287, May.
    2. Zhiming Li & Konda Gokuldoss Pradeep & Yun Deng & Dierk Raabe & Cemal Cem Tasan, 2016. "Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off," Nature, Nature, vol. 534(7606), pages 227-230, June.
    3. Qing-Jie Li & Howard Sheng & Evan Ma, 2019. "Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
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