Effect of CeO2 on microstructure and properties of CoCrCuFeNiTi high entropy alloy cladding layers

• 發表在: Cailiao gongcheng
• Main Authors: NIU Haiyun, LIU Wei, XIAO Jingwei, XIE Ziti, ZHANG Jingyi, LIU Chenxin, MA Pengfei, WANG Kaiming
• 格式: Article
• 語言: 中文
• 出版: Journal of Materials Engineering 2025-10-01
• 主題: laser cladding; high entropy alloy; ceo2; microhardness; wear resistance; corrosion resistance
• 在線閱讀: https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2025.000093
• ISSN: 1001-4381

The CoCrCuFeNiTi high entropy alloy cladding layers with 2%（mass fraction）CeO₂ and without CeO₂ are respectively prepared on the surface of Q550 steel by laser cladding technology. The phase composition， microstructure，and elemental distribution of the two cladding layers are analyzed by characterization methods such as XRD， SEM， and EDS. The microhardness， wear resistance and corrosion resistance of the cladding layers are tested by using a Vickers hardness tester， a friction and wear testing machine and an electrochemical workstation. The results show that the addition of CeO₂ does not change the FCC+BCC two-phase structure of the cladding layers， but it causes lattice distortion， resulting in the diffraction peaks moving towards a low angle. The addition of CeO₂ refines the grain size of the cladding layers and makes the element distribution more uniform. The average microhardness of the cladding layers increases from 451.94HV0.5 to 533.50HV0.5， the wear mass loss decreases from 0.0031 g to 0.0029 g， and the wear mechanism changes from adhesive wear to abrasive wear. After adding CeO₂， the corrosion current density of the cladding layers decreases from 9.336 μA·cm-2 to 2.137 μA·cm-2， the charge transfer resistance increases from 0.332×104 Ω·cm2 to 1.771×104 Ω·cm2， and the corrosion resistance is enhanced.