纳米TiB<sub>2</sub>对CoCrFeNiSi高熵合金涂层耐磨与耐蚀性能的影响

doi:10.11896/cldb.23090210

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Abstract CoCrFeNiSi-xTiB₂(x=2.5%, 5.0%, 7.5%, 10.0%, in weight percentage) high-entropy alloy (HEA) composite coatings were laser clad on 40Cr surface. The phase, microstructure, hardness, friction wear, and electrochemical corrosion properties of the coatings were analyzed, and the influence of nano-TIB₂ ceramic particles on the HEA coating was discussed. The results showed that when x=2.5%, 5.0%, 7.5%, the coating phases were composed of biphase FCC and BCC, and when x=10.0%, boride CrB was formed on the basis of the two phases, and the microstructure changed from equiaxial crystals to typical columnar dendrites. The microhardness of the coating increased with the increase of nano-TiB₂ particles. When x=10.0%, the average hardness of the coating reached its maximum value of HV547.11, about 2.72 times higher than that of the substrate. The hardness increase could be ascribed mainly to solid solution strengthening and dispersion strengthening. With the increase of TiB₂ content, the wear loss of the composite coating decreased significantly, and the wear loss was only 0.13 mg by adopting an x value of 10.0%. In general, the increasing addition of TiB₂ results in the conversion of main wear mechanism of the composite coating from severe abrasive wear and oxidation wear into slight abrasive wear and oxidation wear, and an obviously improved wear resistance. In 3.5%NaCl solution, the composite coating with x=7.5% achieved the best wear resistance.

Key words： high-entropy alloy (HEA) laser cladding nano-ceramics wear resistance corrosion resistance

Published: 10 February 2025 Online: 2025-02-05

CLC number:

TG174.4

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	ZHANG Zejiang
	LI Xinmei
	ZHU Chunjin
	LI Hang
	YANG Dingli

Cite this article:

ZHANG Zejiang,LI Xinmei,ZHU Chunjin, et al. Effect of Nano-TiB₂ on Wear and Corrosion Resistance of CoCrFeNiSi High-entropy Alloy Coating[J]. Materials Reports, 2025, 39(3): 23090210-9.

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http://www.mater-rep.com/EN/10.11896/cldb.23090210 OR http://www.mater-rep.com/EN/Y2025/V39/I3/23090210

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