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Twinning in metastable high-entropy alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang, 621900, PR China.
Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, SE-75120, Uppsala, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Department of Physics, Pukyung National University, Busan, 608-737, Republic of Korea.
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, no 1, article id 2381Article in journal (Refereed) Published
Abstract [en]

Twinning is a fundamental mechanism behind the simultaneous increase of strength and ductility in medium- and high-entropy alloys, but its operation is not yet well understood, which limits their exploitation. Since many high-entropy alloys showing outstanding mechanical properties are actually thermodynamically unstable at ambient and cryogenic conditions, the observed twinning challenges the existing phenomenological and theoretical plasticity models. Here, we adopt a transparent approach based on effective energy barriers in combination with first-principle calculations to shed light on the origin of twinning in high-entropy alloys. We demonstrate that twinning can be the primary deformation mode in metastable face-centered cubic alloys with a fraction that surpasses the previously established upper limit. The present advance in plasticity of metals opens opportunities for tailoring the mechanical response in engineering materials by optimizing metastable twinning in high-entropy alloys. 

Place, publisher, year, edition, pages
Nature Publishing Group , 2018. Vol. 9, no 1, article id 2381
Keywords [en]
alloy, ductility, entropy, exploitation, metal, numerical model, plasticity, strength, thermodynamics, twinning, Article, energy, metastable twinning, physical phenomena
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236560DOI: 10.1038/s41467-018-04780-xISI: 000435453200009Scopus ID: 2-s2.0-85048840281OAI: oai:DiVA.org:kth-236560DiVA, id: diva2:1266117
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Vinnova, 2014-03374Carl Tryggers foundation
Note

QC 20181127

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-05-10Bibliographically approved

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