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Thermal expansion in FeCrCoNiGa high-entropy alloy from theory and experiment
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.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Dalarna University, Sweden.
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2017 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 110, no 24, 241902Article in journal (Refereed) Published
Abstract [en]

First-principle alloy theory and key experimental techniques are applied to determine the thermal expansion of FeCrCoNiGa high-entropy alloy. The magnetic transition, observed at 649 K, is accompanied by a significant increase in the thermal expansion coefficient. The phase stability is analyzed as a function of temperature via the calculated free energies accounting for the structural, magnetic, electronic, vibrational and configurational contributions. The single- and polycrystal elastic modulus for the ferro- and paramagnetic states of the face-centered and body-centered cubic phases are presented. By combining the measured and theoretically predicted temperature-dependent lattice parameters, we reveal the structural and magnetic origin of the observed anomalous thermal expansion behavior.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2017. Vol. 110, no 24, 241902
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Identifiers
URN: urn:nbn:se:kth:diva-209983DOI: 10.1063/1.4985724ISI: 000403678300010Scopus ID: 2-s2.0-85020521759OAI: oai:DiVA.org:kth-209983DiVA: diva2:1116858
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Swedish Research CouncilSwedish Foundation for Strategic Research VINNOVA, 2014-03374Carl Tryggers foundation
Note

QC 20170628

Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2017-07-11Bibliographically approved

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CiteExportLink to record
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