Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-018-04780-x
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Funding
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Sweden's Innovation Agency (VINNOVA Grant) [2014-03374]
- Swedish Foundation for International Cooperation in Research and Higher Education
- Carl Tryggers Foundation
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [NRF-2017R1A2A1A18071775]
- China Scholarship Council
- Hungarian Scientific Research Fund [OTKA 109570]
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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.
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