Microstructure and wear properties of TiN–Al2O3–Cr2B multiphase ceramics in-situ reinforced CoCrFeMnNi high-entropy alloy coating

• Published in: Materials chemistry and physics Vol. 276; p. 125352
• Main Authors: Zhang, Baosen, Yu, Yaqiu, Zhu, Shuaishuai, Zhang, Zhijia, Tao, Xuewei, Wang, Zhangzhong, Lu, Bin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15-01-2022; Elsevier BV
• Subjects: Abrasive wear; Adhesive wear; Aluminum oxide; Ceramic bonding; Ceramic coatings; Ceramics; Entropy; Face centered cubic lattice; Hardness; High entropy alloys; High temperature; High-entropy alloy coating; Load transfer; Multiphase; Oxidation; Plasma cladding; Protective coatings; Solid solutions; Wear mechanisms; Wear properties; Wear rate; Wear resistance; High-entropy alloy coating; Wear properties; Plasma cladding; Ceramics
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2021.125352

In order to improve the hardness and wear resistance of high entropy alloy (HEA) coating, the TiN–Al2O3–Cr2B 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–Al2O3–Cr2B multiphase ceramics, and exhibited the good bonding in interface. Compared with the pure CoCrFeMnNi coating, the hardness of the composite coating (320 HV0.3) increased by 71.90%, owing to the dispersion distribution of TiN–Al2O3–Cr2B 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 mm3 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–Al2O3–Cr2B 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–Al2O3–Cr2B multiphase ceramics reinforced CoCrFeMnNi high-entropy alloy coating was prepared by plasma cladding.•The TiN–Al2O3–Cr2B 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.