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The effect of cooling rate on the microstructure and mechanical properties of NiCoFeCrGa high-entropy alloy
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, S-10044 Stockholm, Sweden.;Dalarna Univ, Mat Sci Grp, S-79188 Falun, Sweden..
Wigner Res Ctr Phys, Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary.;Eotvos Univ Budapest, Dept Mat Phys, Pazmany P Setany 1-A, H-1117 Budapest, Hungary..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, S-10044 Stockholm, Sweden..
Eotvos Univ Budapest, Dept Mat Phys, Pazmany P Setany 1-A, H-1117 Budapest, Hungary..
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 twoFCC and BCCphases, 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
Springer, 2019. Vol. 54, no 6, p. 5074-5082
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Materials Engineering
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URN: urn:nbn:se:kth:diva-240986DOI: 10.1007/s10853-018-03196-8ISI: 000453927400051Scopus ID: 2-s2.0-85058001002OAI: oai:DiVA.org:kth-240986DiVA, id: diva2:1277497
Note

QC 20190110

Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-01-10Bibliographically approved

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Molnár, Dávid SándorHuang, Shuo

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