The hierarchical energy landscape of screw dislocation motion in refractory high-entropy alloys

Wang, Xinyi; Maresca, Francesco; Cao, Penghui

doi:10.1016/j.actamat.2022.118022

The hierarchical energy landscape of screw dislocation motion in refractory high-entropy alloys

Journal Article · Wed May 11 00:00:00 EDT 2022 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2022.118022· OSTI ID:1976791

^[1]; Maresca, Francesco ^[2]; ^[3]

Univ. of California, Irvine, CA (United States); OSTI
Univ. of Groningen (Netherlands)
Univ. of California, Irvine, CA (United States)

High-entropy alloys (HEAs) with concentrated solid solutions are conceived to possess a rugged atomic and energy landscape in which dislocation motion necessarily proceeds to accommodate mechanical deformation. Fundamental questions remain as to how rough the energy landscape is and to what extent it can be influenced by the local ordering of their constituent elements. Here, we construct and report the potential energy landscape (PEL) governing screw dislocation motion in refractory HEAs that reveals a hierarchical and multilevel structure with a collection of small basins nested in large metabasin. This striking feature pertaining to HEAs exerts a trapping force and back stress on saddle point activations, retarding dislocation movement. Further, by introducing chemical short-range order, the energy landscape is smoothed but skewed to different degrees that shifts the rate-liming process from kink-glide to kink-pair nucleation. The chemical disorder-roughened PEL in HEAs, analogous to structural disorder induced in metallic glasses, signifies the role of various barrier-hopping processes underlying the extraordinary mechanical behaviors of the two distinct groups of materials.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0022295

OSTI ID:: 1976791

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 234; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
High-entropy alloys
Materials Science
Metallurgy & Metallurgical Engineering
Potential energy landscape
Screw dislocation
Short-range order

The hierarchical energy landscape of screw dislocation motion in refractory high-entropy alloys

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