An investigation of abnormal grain growth in Zr doped CoCrFeNi HEAs through in-situ formed oxide phases

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dc.contributor.authorTekin, Mustafa
dc.contributor.authorPolat, Gokhan
dc.contributor.authorKotan, Hasan
dc.date.accessioned2024-02-23T14:03:17Z
dc.date.available2024-02-23T14:03:17Z
dc.date.issued2022
dc.departmentNEÜen_US
dc.description.abstractAbnormal grain growth (AGG) in nanocrystalline (CoCrFeNi)(100-x)Zr-x (x = 1 and 4 at. %) HEAs, prepared through high energy mechanical alloying, was comprehensively investigated upon annealing. Transmission electron microscopy (TEM), including high angle annular dark field imaging (HAADF) and energy dispersive spectroscopy (EDS) mapping, focused ion beam microscopy (FIB), and X-ray diffraction experiments (XRD) were utilized to investigate the microstructures as a function of added Zr content and temperature exposures. The results showed that nanocrystalline grains of the as-milled HEAs did not increase significantly upon annealing up to 700 degrees C as the nanocrystalline grain sizes were retained. However, grain growth was observed in (CoCrFeNi)(99)Zr-1 after annealing at 900 degrees C, which turned into AGG after annealing at a higher temperature of 1100 degrees C, disrupting the equiaxed grain structures observed at 900 degrees C. Although the increased amount of Zr doping reduced the average grain size in (CoCrFeNi)(96)Zr-4, bimodal grain structure existed in the microstructure composed of a matrix with 255 nm grain size and abnormally grown grains up to 3 mu m. The observed AGG was attributed to the pinning effect of in-situ formed secondary oxide phases. The microstructural evolution as a function of Zr doping and annealing temperatures was also correlated with the microhardness test results. The AGG and bimodal grain structure reported for the Zr doped CoCrFeNi HEA may open a new avenue to produce HEAs with the enhanced strength-ductility combination due to the incorporation of larger grains and in-situ formed oxide phases in a fine-grained matrix.en_US
dc.description.sponsorshipNecmettin Erbakan University, TURKEY, through the Scientific Research Projects Coordination Unit (BAP) [211219004]en_US
dc.description.sponsorshipAcknowledgment The research reported in this paper was supported by Necmettin Erbakan University, TURKEY, through the Scientific Research Projects Coordination Unit (BAP) under project number 211219004.en_US
dc.identifier.doi10.1016/j.intermet.2022.107588
dc.identifier.issn0966-9795
dc.identifier.issn1879-0216
dc.identifier.scopus2-s2.0-85129913404en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.intermet.2022.107588
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12048
dc.identifier.volume146en_US
dc.identifier.wosWOS:000800472600004en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofIntermetallicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectHigh-Entropy Alloysen_US
dc.subjectAbnormal Grain Growthen_US
dc.subjectSecond Phasesen_US
dc.subjectBimodal Grain Structureen_US
dc.subjectMechanical Alloyingen_US
dc.subjectNanocrystallineen_US
dc.titleAn investigation of abnormal grain growth in Zr doped CoCrFeNi HEAs through in-situ formed oxide phasesen_US
dc.typeArticleen_US

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