Friction and wear and high temperature oxidation properties of AlCrCuFeNbxNiTi high entropy alloys
AlCrCuFeNbxNiTi high entropy alloys were prepared by vacuum arc melting method,and microstructure,friction and wear properties,and high temperature oxidation properties of the as-cast alloys were investigated.The results show that the addition of Nb element promotes the formation of Laves phase,and the phase structure of the AlCrCuFeNiTi alloy changes from L2,phase,BCC phase and FCC phase to L21 phase,Laves phase and FCC phase of the AlCrCuFeNb0.5NiTi alloy.The addition of Nb element will reduce the wear resistance of the AlCrCuFeNiTi alloy,the wear rate of the alloy increases from 1.572×10-5 mm3/(N·m)for the AlCrCuFeNiTi alloy to 4.483×10-5 mm3/(N·m)for the AlCrCuFeNb0.5NiTi alloy,and the room temperature wear mechanism of the alloys is both adhesive wear.The oxidation kinetics of the alloys follow the parabolic rate law,and the effect of Nb element on the high-temperature oxidation performance of the AlCrCuFeNbxNiTi alloy changes with the change of temperature.Its high-temperature oxidation performance can be improved at 800 and 900 ℃,but the severe internal oxidation phenomenon of Laves phase at 1000 ℃ leads to a deterioration of its high-temperature oxidation performance.
AlCrCuFeNiTi-based high entropy alloyNb elementmicrostructurefriction and wearhigh-temperature oxidation
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