Microstructure and properties of CoCrFeNiTix high-entropy alloy coating by laser cladding
In order to study the effects of Ti element on the microstructure and properties of high-entropy alloy coatings,CoCrFeNiTix(x=0.4,0.6,0.8,1.0)coatings were prepared on the surface of Q235 substrate using laser cladding technology,and the phase structure and microstructure of the coatings were analysed by XRD,SEM,EDS,etc.,and the hardness and wear resistance of the coatings were tested by micro-Vickers hardness tester and friction and wear tester.The results show that the microstructure of the coating changes from cellular crystal to dendritic crystal,and the phase structure consists of BCC and FCC.The increase in microhardness of the coatings is attributed to the combined effect of solid solution strengthening and fine crystal strengthening,and the wear mechanisms of the coatings are mainly abrasive wear and adhesive wear,accompanied by slight oxidation.When x=0.8,the hardness(HV)of the coating reaches 524,with relatively flat abrasive marks and excellent wear resistance.
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