Abstract
In order to improve the hardness and wear resistance of high entropy alloy (HEA) coating, the TiN–Al 2 O 3 –Cr 2 B multiphase ceramics reinforced CoCrFeMnNi high-entropy alloy coating was prepared by the plasma cladding. The composite coating was composed of face-centered-cubic (FCC) structure alloy phase and the in-situ synthesized TiN–Al 2 O 3 –Cr 2 B multiphase ceramics, and exhibited the good bonding in interface. Compared with the pure CoCrFeMnNi coating, the hardness of the composite coating (320 HV 0.3 ) increased by 71.90%, owing to the dispersion distribution of TiN–Al 2 O 3 –Cr 2 B multiphase ceramics and the solid solution of Al/Ti in the HEA matrix. The wear rate of reinforced HEA composite coating were 0.51 × 10 −5 , 0.98 × 10 −5 , 0.30 × 10 −5 and 0.25 × 10 −5 mm 3 N −1 m −1 , which were 20.48% (25 °C), 34.75% (200 °C), 16.13% (400 °C) and 10.12% (600 °C) of pure HEA coating, respectively. The wear mechanisms of the cladded coatings were adhesive wear, abrasive wear, oxidation wear. The strengthening of TiN–Al 2 O 3 –Cr 2 B multiphase ceramics acted as a disincentive to the adhesive wear of the composite coating during high temperature sliding progress. Besides, the multiphase ceramics played the load-bearing and load transfer role to improve the wear resistance of the composite coating. • The TiN–Al 2 O 3 –Cr 2 B multiphase ceramics reinforced CoCrFeMnNi high-entropy alloy coating was prepared by plasma cladding. • The TiN–Al 2 O 3 –Cr 2 B multiphase ceramics were in-stiu synthesized in HEA matrix. • The strengthening mechanisms were dispersion distribution of multiphase ceramics and the solution of Al/Ti in HEA matrix. • The ceramics in the composite coating played the load-bearing and load transfer role to improve the wear resistance.
Published Version
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