Microstructure and properties of laser-clad FeNiCoCrTi_0.5Nb_0.5 high-entropy alloy coating

ABSTRACT

FeNiCoCrTi_0.5Nb_0.5 high-entropy alloy coating is prepared on AISI 1045 steel by laser cladding. The cross-sectional macroscopic morphology, phase, microstructure, microhardness and wear resistance are studied systematically. The results show that FeNiCoCrTi_0.5Nb_0.5 coating has no porosities, cracks or other defects and is well metallurgically bonded to the substrate. The coating is composed of body-centred cubic (BCC) solid solution, face-centred cubic (FCC) solid solution and hard Laves phase. The solid solution phase and Laves phase distribute uniformly and closely in a lamellar shape to form a fine and dense eutectic structure. The microhardness of FeNiCoCrTi_0.5Nb_0.5 coating is about three times that of the substrate. Compared with the substrate, the coating has superior wear resistance.

KEYWORDS:

• High-entropy alloy coating
• AISI 1045 steel
• laser cladding
• microstructure
• wear resistance

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 51605473], youth fund project, the National Key Research and Development Program of China [grant number 2018YFB1105801].