Microstructure and Properties of AlCoxCrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting
High-entropy alloy coatings have a very wide range of industrial applications due to their outstanding mechanical properties and good wear resistance.High-entropy alloy coatings of AlCoxCrFeNiCu(x = 0,0.5,1.0,1.5,2.0,mole fraction)on 45 steel substrates were successfully produced by cold spray-ing assisted induction remelting approach.The effect of Co content on the phase and microstructure of cold spraying-assisted high-entropy alloy coating was investigated.The findings reveal that the AlCox-CrFeNiCu high-entropy alloy coating produced using low-pressure cold spraying assisted induction re-melting technique comprises of fcc + bcc two-phase mixed structure,with an equiaxed dendrite + inter-dendritic structure,with the dendrite being bcc and the interdendritic structure being fcc.The lattice distor-tion state of AlCoxCrFeNiCu high-entropy alloy coating changes as the Co element changes;when x = 1.0,the lattice strain of AlCo1CrFeNiCu high-entropy alloy coating is the largest.Increases in Co content promote an increase in dendrite number in AlCoxCrFeNiCu high-entropy alloy coatings,as well as den-drite.The EDS analysis demonstrated that Fe,Cr,Co,and Ni were enriched in the dendrite,Cu was en-riched in the interdendrite,and Al was evenly distributed throughout the coating.With an increase in Co content,the hardness of AlCoxCrFeNiCu high-entropy alloy coating increases first and then decreases.When x = 1.0,the hardness of the AlCo1CrFeNiCu high-entropy alloy coating is 562.5 HV,and the coating minimum's friction coefficient is 0.352.
cold sprayinginduction remeltinghigh-entropy alloy coatingfriction and wear
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