Effect of CeO₂ doping on microstructure, friction and wear properties of AlCoCrCuFe high-entropy alloys

AlCoCrCuFe high-entropy alloy was fabricated by melting-casting method. The phase structure, microstructure and friction and wear property for this alloy without and with CeO2 doping were investigated by XRD, SEM, EDS, microhardness tester and friction-wear tester, respectively. The results show that AlCoCrCuFe alloy has BCC+FCC dual phase structure. 1%(mass fraction)CeO2 addition improves the diffraction peak of AlCoCrCuFe alloy. The microstructure of two above alloys is typical dendrite structure. The interdendrite region is mainly Cu-rich and Ce-rich area, and the dendrite microstructure is layered grid structure of spinodal decomposition. After CeO2 adding, the microhardness increases from 441.5HV to 475.3HV, and the friction coefficient and the mass loss rate decrease from 0.55 and 1.44% to 0.4 and 1.28%, respectively