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The effect of cooling rate on the microstructure and mechanical properties of NiCoFeCrGa high-entropy alloy
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.ORCID iD: 0000-0002-7355-1941
2019 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 54, no 6, p. 5074-5082Article in journal (Refereed) Published
Abstract [en]

The effect of cooling rate on the microstructure and mechanical properties of equimolar NiCoFeCrGa high-entropy alloy (HEA) was studied by scanning electron microscopy, energy-dispersive X-ray spectroscopy and electron backscatter diffraction (EBSD), as well as by microhardness tests. Experimental results show that the cooling rate has a crucial impact on the developing microstructure which has a mixture of two—FCC and BCC—phases, leading to a self-similarity of the solidified structure formed in the sample. Furthermore, the cooling rate influences both the composition of the two phase-components and the ratio of their volume fractions, determining the mechanical properties of the sample. The present results confirm the grouping of Co, Fe and Cr in the FCC phase and that of Ni and Ga in BCC phase in the NiCoFeCrGa high-entropy alloy system. An empirical rule is suggested to predict how the phase-components can be expected in this complex high-entropy alloy.

Place, publisher, year, edition, pages
2019. Vol. 54, no 6, p. 5074-5082
Keywords [en]
high entropy alloy, microstructure, EBSD
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-29174DOI: 10.1007/s10853-018-03196-8ISI: 000453927400051Scopus ID: 2-s2.0-85058001002OAI: oai:DiVA.org:du-29174DiVA, id: diva2:1273220
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-01-07Bibliographically approved

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Molnar, David

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CiteExportLink to record
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  • nn-NB
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Output format
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