Microstructure and Mechanical Properties of Equiatomic CoCrFeNiMn High-Entropy Alloy Coatings Fabricated by High-Velocity Oxygen Fuel Spraying
Kambarov Y. Sagdoldina Z. Sulyubayeva L. Kowalewski P. Nabioldina A.
February 2026Multidisciplinary Digital Publishing Institute (MDPI)
Crystals
2026#16Issue 2
High-entropy coatings based on CoCrFeNiMn obtained by thermal spraying have demonstrated the potential to improve the wear resistance of traditional materials used in extreme conditions. The aim of the work was to study the effect of the oxygen/fuel ratio when using kerosene as fuel in the HVOF process on the microstructural characteristics of CoCrFeNiMn coatings, including phase composition, microhardness, elastic modulus, and wear resistance. Phase and microstructural transformations in gas-atomized powder during HVOF spraying were analyzed using XRD, SEM, and EDS methods. The tribological and mechanical properties of the coatings obtained were also evaluated. The results obtained are consistent with thermodynamic predictions based on the Scheil model for non-equilibrium conditions. The data obtained indicate the high potential of high-entropy CoCrFeNiMn alloys for use as protective coatings for industrial purposes. In addition, the results of the study emphasize the promise of using thermodynamic prediction of high-entropy alloys using Thermo-Calc software. The best mechanical and tribological properties were obtained in the HVOF 1 regime, which provided a maximum microhardness of 783.8 HV and a minimum wear rate of 7.45 × 10−5 mm3 × N−1 × m−1.
hardness , high-entropy alloys , HVOF , microstructure , wear resistance
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Research Center “Surface Engineering and Tribology”, Sarsen Amanzholov East Kazakhstan University, Ust-Kamenogorsk, 070002, Kazakhstan
International School of Engineering, Daulet Serikbayev East Kazakhstan Technical University, Ust-Kamenogorsk, 070003, Kazakhstan
Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wroclaw, 50-370, Poland
Research Center “Surface Engineering and Tribology”
International School of Engineering
Faculty of Mechanical Engineering
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