Effect of laser power on microstructure and properties of AlCoCrFeNi2.1 high entropy alloy coating
A high entropy AlCoCrFeNi2.1 alloy coating was prepared on the surface of Q235 steel substrate using laser cladding technology,and the effect of laser power on microstructure and properties of the coating was studied.Microstructure,phase,mechanical propertiesand corrosion resistance of the AlCoCrFeNi2.1 high entropy alloy coating were analyzed using X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis,Vickers microhardness tester,friction and wear tester,and electrochemical workstation.The results show that the microstructure of the AlCoCrFeNi2.1 high entropy alloy coating prepared by laser cladding is composed of solid solution phases with body centered cubic(BCC)structure and face centered cubic(FCC)structure.When the laser power is greater than 1200 W,the BCC(α-Fe)solid solution phase in the coating gradually increases,and the grains gradually transform from equiaxed crystals and columnar dendrites to fine equiaxed crystals.With the increase of laser power,the hardness of the coating shows a trend of first increasing and then decreasing.When the laser power is 1600 W,the hardness of the coating is the highest of 403.6 HV0.2,which is about 2.5 times that of the substrate,the wear resistance of the coating reaches its optimal level,with a wear rate of 0.39×10-5 g·N-1·m-1,and the self corrosion current density is the lowest of 5.23×10-9 A·cm-2,indicating the best corrosion resistance.
AlCoCrFeNi2.1 high entropy alloymicrostructurewear resistancecorrosion resistance
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