Grain size stabilization of oxide dispersion strengthened CoCrFeNi-Y2O3 high entropy alloys synthesized by mechanical alloying

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dc.contributor.authorTekin, Mustafa
dc.contributor.authorPolat, Gokhan
dc.contributor.authorKalay, Y. Eren
dc.contributor.authorKotan, Hasan
dc.date.accessioned2024-02-23T14:12:32Z
dc.date.available2024-02-23T14:12:32Z
dc.date.issued2021
dc.departmentNEÜen_US
dc.description.abstractNanocrystalline CoCrFeNi high entropy alloys (HEAs) with 1 and 4 wt% nanosized Y2O3 were synthesized by high energy mechanical alloying and subjected to annealing treatments at different temperatures up to 1100 degrees C. X-ray diffraction (XRD), focused ion beam microscopy (FIB), and transmission electron microscopy (TEM) were used to investigate the microstructures of as-milled and annealed HEAs as a function of annealing temperature and Y2O3 content. The results have shown that the as-milled HEAs were solid solutions with face-centered cubic (fcc) crystal structure, which remained stable even after annealing at 1100 degrees C. The as-milled nanocrystalline CoCrFeNi HEA revealed grain growth upon annealing, reaching 293 nm and 1.45 mu m after annealing at 900 and 1100 degrees C, respectively. This suggests that the nanocrystalline microstructure of CoCrFeNi is not thermally stable at high temperatures. The grain size stability was found to reach around 72 nm with nanosized Y2O3 particles after annealing at 1100 degrees C. Accordingly, 477 +/- 20 HV asmilled hardness of CoCrFeNi was dramatically reduced to 220 +/- 14 HV after annealing at 1100 degrees C due to severe grain coarsening but retained around 450 +/- 23 HV with 4 wt% Y2O3 addition. The correlation between microstructure and hardness was utilized to evaluate the mechanical properties. (c) 2021 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipScientific Research Projects Coordination Unit of Necmettin Erbakan University, Turkey [181219015]en_US
dc.description.sponsorshipThe authors would like to thank the Scientific Research Projects Coordination Unit of Necmettin Erbakan University, Turkey under project number of 181219015.en_US
dc.identifier.doi10.1016/j.jallcom.2021.161363
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85111679456en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2021.161363
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12101
dc.identifier.volume887en_US
dc.identifier.wosWOS:000697520600001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofJournal Of Alloys And Compoundsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectHigh-Entropy Alloysen_US
dc.subjectMechanical Alloyingen_US
dc.subjectOxide Dispersion Strengtheningen_US
dc.subjectGrain Growthen_US
dc.subjectThermal Stabilityen_US
dc.titleGrain size stabilization of oxide dispersion strengthened CoCrFeNi-Y2O3 high entropy alloys synthesized by mechanical alloyingen_US
dc.typeArticleen_US

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