Phase evolution of CoCrCuFeNiSix high-entropy alloys prepared by mechanical alloying and spark plasma sintering

In this study, the phase evolution and properties of CoCrCuFeNiSix (x = 0, 0.3, 0.6 and 0.9 atomic ratios) high entropy alloys prepared by powder metallurgy route is investigated. The x-ray diffraction analysis reveals the presence of mixed phases of the face-centered and body-centered cubic phase a...

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Bibliographic Details
Published in:Materials research express 2019-02, Vol.6 (2)
Main Authors: Kumar, Anil, Dhekne, Pushkar, Swarnakar, Akhilesh Kumar, Chopkar, Manoj
Format: Article
Language:English
Subjects:
corrosion
high entropy alloys
mechanical alloying
spark plasma sintering
x-ray diffraction
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Summary:In this study, the phase evolution and properties of CoCrCuFeNiSix (x = 0, 0.3, 0.6 and 0.9 atomic ratios) high entropy alloys prepared by powder metallurgy route is investigated. The x-ray diffraction analysis reveals the presence of mixed phases of the face-centered and body-centered cubic phase after 20 h of milling. The addition of Si (0.3, 0.6 and 0.9) favors the formation of the body-centered cubic structure during mechanical alloying. However, heating during spark plasma sintering encourages the transformation of the body-centered phases evolved after mechanical alloying to the face-centered and sigma phases. The microhardness value of CoCrCuFeNiSi0.9 high entropy alloy increased about 55% than the CoCrCuFeNi alloy. Furthermore, the enhancement in wear resistance from 0.230 km mm−3 for CoCrCuFeNi to 0.933 km mm−3 for CoCrCuFeNiSi0.9 alloys are observed with the Si addition. Additionally, corrosion resistance in potentiodynamic polarization measurement also enhanced with Si addition.
ISSN:2053-1591
DOI:10.1088/2053-1591/aaed63