Competitive relationship between the FCC + BCC dual phases in the wear mechanism of laser cladding FeCoCrNiAl0.5Ti0.5 HEAs coating

• Published in: Surface & coatings technology 2024-10, Vol.493, p.131315, Article 131315
• Main Authors: Guo, Yifan, Yang, Fan, Lu, Bingwen, Qiu, Hao, Zhu, Jiangqi, Wang, Di, Yan, Xingchen, Qiu, Zhaoguo, Yin, Shuo, Liu, Min
• Format: Article
• Language: English
• Subjects: High-entropy alloys; Laser cladding; Microstructure; Wear mechanism
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2024.131315

This work elaborated the microstructure and wear behavior of laser cladding (LC) FeCoCrNiAl0.5Ti0.5 high-entropy alloys (HEAs) coatings on AISI 1045 steel substrates. The microstructure of the HEAs coatings is mainly comprised of a body-centered-cubic (BCC) + face-centered-cubic (FCC) dual-phase structure. Besides, the coating exhibites high hardness. During the friction process, the FCC phase was more prone to deformation and peeling than BCC structure. As the alloying elements (such as Al, Ti, and Cr) tend to form oxide film at high temperatures during friction, the friction process of the LC FeCoCrNiAl0.5Ti0.5 coating was mainly controlled by oxidative wear and adhesive wear mechanisms. Friction test results showed that the coating owned excellent wear resistance and the wear rate of the HEAs coating was only 6.53 % of the wear rate of the steel substrate. •The tribological behavior of FCC and BCC phases was investigated.•Competitive relationship between the FCC + BCC dual phases in the wear mechanism of HEAs coating was investigated.•The multiscale relationship of elements oxidation, phase deformation and dislocation movement was studied.