Abstract
High entropy alloy coatings have shown a fast development potential in wear resistance application. However, most of them are not strong enough for practical applications. In the present study, FeCoNiCrSiAlx high entropy alloy coatings with Al content of 0.5, 1.0 and 1.5 M ratios were prepared by atmospheric plasma spray. The microstructure of milled powders, as-sprayed and heat-treated coatings were analyzed. The tribological properties of FeCoNiCrSiAlx coatings sliding against WC-12Co balls in dry and water conditions were investigated. The results show that the as-sprayed FeCoNiCrSiAlx coatings are mainly BCC phase with minor amount of FCC phase. The addition of Al has little effect on the phases of as-sprayed coatings, but has a great impact on that of heat-treated coatings. Cr3Ni5Si2 intermetallic was formed in the heat-treated coatings. Under dry sliding condition, wear rates of as-sprayed coatings decrease gradually with the addition of Al element. The heat-treated FeCoNiCrSiAl1.0 coating exhibits the lowest wear rate, which is attributed to the formation of BCC and Cr3Ni5Si2 phases. Splat spalling is the main wear mechanism for dry sliding. The wear rates of coatings under water sliding condition are much lower than that under dry sliding condition, and are in little influence from the Al content and heat treatment. Mild abrasive wear is the dominating wear mechanism for water sliding.
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