Abstract
This study deals with Al2O3-13wt.%TiO2-reinforced CoCrFeMnNi high-entropy alloy (HEA) composite coatings prepared by plasma spraying. The effect of the Al2O3-TiO2 ceramic phase on the microstructure, mechanical properties and high-temperature tribological performance of the as-sprayed composite coatings was investigated. The results showed that the composite coatings consisted of a HEA phase with a FCC (face-centered cubic) structure and an Al2O3-TiO2 ceramic phase with a three-dimensional network structure. The coatings presented a typical layered structure with less porosity than pure HEA coatings. The three-dimensional network structure was mainly due to partially melted Al2O3-13wt.%TiO2 particles during the spraying process. The composite coating with Al2O3-TiO2 ceramic phase had an improved plastic deformation resistance and a reduced elastic recovery resistance. Its wear rate was lower than that of the pure HEA coating. The main wear mechanisms included oxidation, wear and adhesive wear. The Al2O3-TiO2 ceramic phase reduced the adhesive wear and promoted the tribological behavior of the HEA composite coating at low temperature. The excellent wear resistance of the as-sprayed coating at high temperatures was mainly due to the formation of an oxide layer on the worn surface.
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Acknowledgments
This research work is supported by the National Key R&D Program of China (2018YFC1902404), National Natural Science Foundation of China (51775259), Natural Science Foundation of Jiangsu Province (BE2018091) and the Six Talent Peaks Project in Jiangsu Province.
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Shuaishuai Zhu and Zhijia Zhang share the first authorship of this paper.
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Zhu, S., Zhang, Z., Zhang, B. et al. Microstructure and Properties of Al2O3-13wt.%TiO2-Reinforced CoCrFeMnNi High-Entropy Alloy Composite Coatings Prepared by Plasma Spraying. J Therm Spray Tech 30, 772–786 (2021). https://doi.org/10.1007/s11666-021-01170-6
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DOI: https://doi.org/10.1007/s11666-021-01170-6