Effects of Ti and Al Elements on Microstructure and Wear Resistance of FeCoCrNiCu0.3 High Entropy Alloy Coating
FeCoCrNiCu0.3,FeCoCrNiTiCu0.3 and FeCoCrNiAlCu0.3 high entropy alloy coatings were prepared on the surface of 38CrMoAl by laser cladding synchronous powder feeding technology.Optical Microscopy(OM),scanning electron microscope(SEM),X-ray diffraction(XRD),energy spectrum analyzer(EDS),Vickers hardness tester and friction tester were used to systematically characterize the phase,microstructure,wear and corrosion resistance of high entropy alloy coating.The results show that the addition of Ti and Al element promotes the transformation of coating phase structure from face centered cubic structure(FCC)to body centered cubic structure(BCC),change to BBC+FCC phase.Al is more effective in promoting the formation of BCC phase in high entropy alloy and making BCC phase become the dominant phase of the alloy.The addition of Ti and Al makes the dendrite structure of the cladding zone finer and the dendrite spacing smaller.FeCoCrNiAlCu0.3 has higher microhardness,up to 683.5 HV0.3.The effect of Ti and Al on the wear resistance of high entropy alloy coating is similar to that of hardness,FeCoCrNiAlCu0.3 shows better wear resistance.The wear mechanism of the coating changes from fatigue wear to abrasive wear with the addition of Al.The addition of Ti makes the wear mechanism of the coating completely change into fatigue wear.Ti and Al elements have the opposite trend to promote the transformation of wear mechanism.
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