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The eutectic FeNiCoCrTi 0.6 Nb 0.4  high-entropy alloy coating (HEAC) is annealed in Argon at 450°C, 850°C and 1050°C to investigate the thermal stability. The results show that annealed coatings are all composed of BCC solid solution and Laves phase with no production of new phases. The fine eutectic cells can be maintained at a higher temperature in that continuous intracellular coarsening does not occur until annealing at 1050°C. With the increase of annealing temperature, the microhardness and wear resistance of FeNiCoCrTi 0.6 Nb 0.4  coating increase first and then decrease slightly. Especially, the microhardness of FeNiCoCrTi 0.6 Nb 0.4  annealed at 1050°C is only 6.03% lower than that of unannealed one, and the wear rate is only 10.70% higher than that of unannealed one, which strongly indicates that eutectic FeNiCoCrTi 0.6 Nb 0.4  HEAC has excellent thermal stability and can be well applied in high-temperature environments.

Thermal stability of eutectic FeNiCoCrTi 0.6 Nb 0.4 high-entropy alloy coating