Effect of Ti content on microstructure and properties of CoCrFeNiCuTix high-entropy alloy coatings by argon arc cladding
CoCrFeNiCuTix(x represents molar ratio,x=0,0.3,0.5,0.8 and 1)high-entropy alloy coatings were prepared on the surface of Q235 steel substrate using argon arc cladding technology.The effect of Ti content on microstructure and mechanical properties of the CoCrFeNiCuTix high-entropy alloys was studied.The results show that the CoCrFeNiCuTix high-entropy alloys with different Ti contents are all FCC single-phase solid solutions.The microstructure of the CoCrFeNiCu alloy is columnar crystal structure.With the addition of Ti,precipitates begin to appear in the microstructure,and the higher the Ti content,the more precipitates there are.The addition of Ti significantly improves the microhardness of the alloys.When the molar ratio of Ti is 1,the cross section microhardness of the coating reaches the highest value of 439.54 HV0.1.Ti has a significant effect on the wear resistance of the CoCrFeNiCuTix high-entropy alloys,and the CoCrFeNiCuTi alloy exhibits the best wear resistance.As the Ti content increases,the wear mechanism of the alloys transforms from adhesive wear to a coexistence of adhesive wear and oxidative wear.
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