Determination of structural, tribological, isothermal oxidation and corrosion properties of Al–Co–Cr–Fe–Ni–Ti–Cu high-entropy alloy
By Sünbül, Sefa Emre; İçi̇n, Kürşat; Şeren, Fatma Zehra; Şahin, Ömer; Çakil, Damla Dilara; Sezer, Raşit; Öztürk, Sultan
Published in Vacuum
2021
Abstract
In the present work, Al10Co24Cr10Fe15Ni34Ti6Cu1 (at.%) was obtained high entropy alloy (HEA) with vacuum arc melting. The microstructure, tribological properties, oxidation, and corrosion resistance of the HEA were detailly investigated. The faced-centered cubic solid solution structure was observed in the microstructure. SEM analysis shows that Fe, Co, and Cr elements are dominant in the dendrite region, the interdendritic regions are significantly enriched in Al and Ti elements. The average friction coefficients for 0.5 MPa, 1 MPa, and 1.5 MPa loads were found as 0.59, 0.64, and 0.68, respectively. The specific wear rates generally raised in consequence of the increase in the same applied loads. The time-dependent oxidation amount exponentially increased in our HEA. Oxide formation appeared as TiO2 and AlFeO3 in the oxidation process at 900 °C. The corrosion potential (Ecorr) and the corrosion current density (Icorr) values of the alloy were determined −0.082 V and 2.18 × 10−8 A/cm2, respectively.