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Microstructure and Tribological Properties of Plasma-Sprayed CoCrFeNi-based High-Entropy Alloy Coatings Under Dry and Oil-Lubricated Sliding Conditions

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Abstract

The CoCrFeNi-based high-entropy alloy coatings were prepared by atmospheric plasma spraying. The microstructure, phase, microhardness and corrosion resistance of the coatings were characterized. The tribological properties of the coatings sliding against GCr15 balls under dry and oil-lubricated sliding conditions were investigated. The results show that the phase composition of the CoCrFeNiAl coating is mainly BCC phase, accompanied by a small amount of FCC phase and AlCrO3 oxide phase. The oxide phase is mostly distributed at the splat interfaces, which leads to a low cohesive strength and high wear rate under both dry and oil-lubricated sliding conditions. The CoCrFeNiMn coating is composed of FCC phase and relatively large amount of MnCr2O4 oxide phase. High oxides content and good plastic deformation ability contribute to the formation of tribolayer on the worn surface, which promotes excellent wear resistance under both conditions. The CoCrFeNiMo0.5 coating consists of mostly FCC phase and a bit of aggregated Cr2FeO4 oxide phase. Its dominant wear mechanism is abrasive wear.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51804272, 51901203) and Cooperation Funding of Yangzhou City-Yangzhou University (Grant No. YZU201801).

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Correspondence to Chao Zhang.

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Credit Line: This article is an invited paper selected from presentations at the 10th Asian Thermal Spray Conference (ATSC 2020) and has been expanded from the original presentation. ATSC 2020 was held in Ningbo, China, from November 1-3, 2020, and was organized by the Asian Thermal Spray Society with Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences as the Host Organizer.

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Xiao, JK., Li, TT., Wu, YQ. et al. Microstructure and Tribological Properties of Plasma-Sprayed CoCrFeNi-based High-Entropy Alloy Coatings Under Dry and Oil-Lubricated Sliding Conditions. J Therm Spray Tech 30, 926–936 (2021). https://doi.org/10.1007/s11666-021-01175-1

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