The origin of jerky dislocation motion in high-entropy alloys

Daniel Utt, Subin Lee, Yaolong Xing, Hyejin Jeong, Alexander Stukowski, Sang Ho Oh (), Gerhard Dehm () and Karsten Albe ()
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Daniel Utt: Technische Universität Darmstadt
Subin Lee: Max-Planck-Institut für Eisenforschung GmbH
Yaolong Xing: Sungkyunkwan University
Hyejin Jeong: Sungkyunkwan University
Alexander Stukowski: Technische Universität Darmstadt
Sang Ho Oh: Sungkyunkwan University
Gerhard Dehm: Max-Planck-Institut für Eisenforschung GmbH
Karsten Albe: Technische Universität Darmstadt

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32134-1

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