Wear-resistant NbMoTaWTi high entropy alloy coating prepared by laser cladding on TC4 titanium alloy

To improve the microhardness and wear resistance of TC4 alloy, NbMoTaWTi high-entropy alloy coating was fabricated on the surface of TC4 alloy by laser cladding. The coating exhibited a single BCC phase. The top microstructure of the coating was dominated by fine dendrites while the bottom region ne...

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Bibliographic Details
Published in:Tribology international 2023-04, Vol.182, p.108366, Article 108366
Main Authors: Ren, Z.Y., Hu, Y.L., Tong, Yonggang, Cai, Z.H., Liu, Jian, Wang, H.D., Liao, J.Z., Xu, S., Li, L.K.
Format: Article
Language:English
Subjects:
Laser cladding
Microstructure
NbMoTaWTi coating
TC4 titanium alloy
Wear resistance
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Summary:To improve the microhardness and wear resistance of TC4 alloy, NbMoTaWTi high-entropy alloy coating was fabricated on the surface of TC4 alloy by laser cladding. The coating exhibited a single BCC phase. The top microstructure of the coating was dominated by fine dendrites while the bottom region near the interface was composed of petal-like coarse dendrites. The microhardness of the coating reached to 600 HV, which was 72% higher than that of the substrate. The wear surface of the coating was flat and adhered to some of abrasive material. The specific wear rate of the coating was 1.37 × 10−4 mm3/(N∙m), which decreased by 121.9% than that of the substrate. The primary wear mechanisms of the coating were oxidative wear and adhesive wear.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2023.108366