Wear and corrosion of CoCrFeNiMnTi_x high entropy alloy coatings by laser cladding

Abstract

CoCrFeNiMnTi_x (x = 0.5, 1.0, 1.5, 2.0 in atomic ratio) high entropy alloy (HEA) coatings were prepared on 304 stainless steel by laser cladding. Experimental results showed that the CoCrFeNiMnTi_x HEAs constituent phase evolved from a single FCC phase for the HEA to FCC + BCC + Intermetallic + Laves phases with the addition of Ti element. The CoCrFeNiMnTi_x coatings exhibited an increasing microhardness from 412.42 HV to 573.97 HV. Accompanying the increase in microhardness, the wear resistance was proportional to the hardness of the coating, which met Archard’s relationship. In addition, the corrosion resistance of the CoCrFeNiMnTi_x coatings displayed an increased tendency firstly and then decreased with the addition of Ti element. And, the HEA coating with x = 1.0 possessed the highest corrosion resistance as indicated by the lower corrosion current density, high charge transfer resistance and high pitting potential.

KEYWORDS:

• Laser cladding
• high entropy alloy
• microstructure
• microhardness
• wear
• corrosion

Acknowledgments

The authors acknowledge to financial support from the National Key Research and Development Program of China (No. 2016YFB1100204), the Science and Research Project of Liaoning Province (No. LJKQZ2021050) and the Shenyang Science and Technology Funded Project (No. 22-101-0-16 and No. 19-109-1-03).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by National Key Research and Development Program of China: [Grant Number No. 2016YFB1100204]; Shenyang Science and Technology Funded Project: [Grant Number No.22-101-0-16 and No. 19-109-1-03]; Science and Research Project of Liaoning Province: [Grant Number No. LJKQZ2021050].