Abstract
The CoCrFeNi high-entropy alloy coatings (HEACs) with different weight ratios (10 and 30 wt.%) of WC additions have been prepared using mechanical alloying and a vacuum hot pressing sintering technique on a Q235 steel substrate. The microstructures, microhardness, wear resistance, and corrosion resistance of HEACs were studied. The CoCrFeNi(WC) powders were obtained by mixing the CoCrFeNi HEA powders and WC particles. The sintered products of both HEACs with high relative density contained one solid solution phase with face-centered cubic structure, WC, and unknown precipitate phases. The transition boundary had a good metallurgical bonding with the coating and substrate. The average microhardness values of CoCrFeNi HEACs with 10 and 30 wt.% WC additions reached 475 and 531 HV respectively, which were far higher than that of the substrate (160 HV). Moreover, both coatings exhibited better wear resistance than the substrate under the same wear conditions. The 30 wt.% WC HEAC displayed the lower friction coefficient, and the shallower wear groove depth. The grain refinement strengthening and second-phase particle strengthening could be beneficial to the enhanced hardness and wear resistance of coatings with WC additions. The corrosion behavior of the tested samples in the 3.5 wt.% NaCl solution were investigated using electrochemical polarization measurements. The CoCrFeNi(WC) coatings all revealed the improved corrosion resistance. Especially, a 10 wt.% WC addition remarkably enhanced the comprehensive corrosion resistance and easy passivation of CoCrFeNi HEAC.
Highlights
High entropy alloys (HEAs), which have received important attention recently, contain multiple principal elements in equimolar or near equimolar ratios, and possess unique phase compositions [1].The development of HEAs is motivated by their excellent properties such as mechanical strength, resistance to oxidation, and soft magnetic properties [2,3,4]
A few unknown phases precipitated from the face-centered cubic (FCC) matrix of the high-entropy alloy coatings (HEACs)
The microhardness and wear resistance of HEACs with WC additions were superior to the Q235 steel substrate and CoCrFeNi coating
Summary
The development of HEAs is motivated by their excellent properties such as mechanical strength, resistance to oxidation, and soft magnetic properties [2,3,4]. They have superior surface properties like high hardness, excellent wear performance, and outstanding corrosion resistance [5,6,7,8,9,10]. The FeNiCoAlCu HEA coating (HEAC) fabricated on the AISI 1045 steel using a laser cladding method had a good wear performance even at high temperature [7]. The AlCrMoNbZr HEAC was deposited on a N36 zirconium alloy
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