Influence of high-temperature condition on the microstructure and properties of FeCoCrNiAl_0.3 and FeCoCrNiAl_0.7 high-entropy alloy coatings

ABSTRACT

In the present study, FeCoCrNiAl_x (x = 0.3, 0.7) coatings were fabricated by laser cladding technology. XRD analysis and scanning electron microscopy (SEM) were used to investigate the evolution of phases and microstructures before and after the high-temperature oxidation test. The micro-hardness, tribological behaviour, and corrosion resistance of the coatings, before and after the high-temperature treatment, were systematically investigated using micro-hardness test, abrasive wear test, and electrochemical corrosion test. The microstructure and properties of FeCoCrNiAl_0.3 cladding layer changed little before and after the high-temperature oxidation test. The high-temperature condition promoted the generation of BCC solid solutions at the grain boundaries when the Al element content was 14.89% (i.e. 0.7 mol). This enhanced the micro-hardness and tribological behaviour, but deteriorated the corrosion resistance.

KEYWORDS:

• FeCoCrNiAl_x (x = 0.3
• 0.7) coating
• FCC solid solution
• BCC solid solution
• high-temperature oxidation test
• tribological behaviour
• corrosion resistance

Acknowledgements

This work was supported by the National Key R&D Program of China [grant number 2018YFB1107900]; and the National Natural Science Foundation of China [grant number 51575383].

Disclosure statement

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

Additional information

Funding

This work was supported by the National Key R&D Program of China [grant number 2018YFB1107900]; and the National Natural Science Foundation of China [grant number 51575383].