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Erdogan, Azmi; Doleker, Kadir Mert; Zeytin, Sakin
JOM (1989), 10/2019, Volume: 71, Issue: 10Journal Article
CoCrFeNiAl x Ti y high-entropy alloys were produced by the induction melting method and their oxidation behavior investigated when exposed to 1000°C for different durations. One or more body-centered cubic phases were found in all alloys, except CoCrFeNiTi 0.5 . In the CoCrFeNiTi 0.5 alloy, two different face-centered cubic phases and one tetragonal sigma phase were detected. Scanning electron microscopy elemental analysis showed that all the alloys exhibited homogeneous microstructure. Energy-dispersive x-ray spectroscopy analysis revealed that Cr and Fe elements were enriched in one phase and Al-Ni-Ti elements in another. The presence of Ti negatively affected the oxidation behavior. According to the oxidation test results, dominant Al 2 O 3 formation was observed in the CoCrFeNiAl 0.5 and CoCrFeNiAlTi 0.5 alloys. As a result, these two alloys exhibited the best performance among the five high-entropy alloys in terms of mass gain and oxide thickness.
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