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Pressure-induced magnetovolume effect in CoCrFeAl high-entropy alloy
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0003-2832-3293
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
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2019 (English)In: Communications Physics, E-ISSN 2399-3650, Vol. 2, article id 42Article in journal (Refereed) Published
Abstract [en]

High-entropy alloys (HEAs) composed of multiple-principal elements with (nearly) equimolar ratio establish a new conceptual framework for alloy design and hold a promise for extensive applications in industry, akin to the controlled expansion alloys (CEAs), such as Invar alloys. Spontaneously, one question emerges - would it be possible to synthesize a novel class of alloys combining the virtues of both CEAs and HEAs? Here, we report the pressure-induced magnetovolume effect in the body-centered-cubic CoCrFeAl HEA coupled with magnetic phase transitions from ferromagnetic to paramagnetic, and to non-magnetic states, originating from the successive collapses of local magnetic moments of Co and Fe. The observed magnetovolume anomalies, occurring in a progressive way, tailor appreciably the coefficient of thermal expansion of CoCrFeAl. These results further strengthen HEAs’ anticipated potential for designing multifunctional materials in virtue of their multiple outstanding properties, and reveal possible routes for their future synthesis.

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2019. Vol. 2, article id 42
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Condensed Matter Physics Earth and Related Environmental Sciences
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URN: urn:nbn:se:uu:diva-382796DOI: 10.1038/s42005-019-0141-9ISI: 000467220700001OAI: oai:DiVA.org:uu-382796DiVA, id: diva2:1313377
Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-11-25Bibliographically approved
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Liu, LeiVitos, LeventeDong, MinjieAlmqvist, Bjarne S.G.Ivanov, SergeyRubensson, Jan-ErikLazor, Peter

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