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

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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… Click to show full abstract

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.

Keywords: phase evolution; entropy alloys; mechanical alloying; high entropy; alloys prepared

Journal Title: Materials Research Express
Year Published: 2018

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