Ti元素对激光熔覆AlCoCrFeNiTi_(0.5)合金涂层组织和耐磨性的影响

Effect of Titanium on the Microstructure and Wear Resistance of AlCoCrFeNiTi_(0.5) Alloy Coating Prepared by Laser Cladding

研究Ti元素的添加对AlCoCrFeNi高熵合金涂层组织、物相、显微硬度及耐磨损性能的影响。通过激光熔覆技术在纯铁表面制备AlCoCrFeNi和AlCoCrFeNiTi_(0.5)高熵合金涂层,使用扫描电镜、X射线衍射仪、显微硬度仪、摩擦磨损试验机对涂层的显微组织、物相组成、显微硬度、耐磨损性能、磨损形貌进行分析研究。结果表明:AlCoCrFeNiTi高熵合金涂层,其相组成有CoTi、AlFe固溶相以及AlCrCo复杂相,出现典型的成分均匀的网状调幅分解组织,在组织结构上优于AlCoCrFeNi高熵合金涂层;同时AlCoCrFeNiTi_(0.5)高熵合金涂层的平均显微硬度达到989 HV_(4.9 N),比AlCoCrFeNi提高了32%,磨损量降低了85%。

This paper aims to study the effect of adding Ti element on the structure,phase,microhardness and wear resistance of AlCoCrFeNi high-entropy alloy coatings.The AlCoCrFeNi and AlCoCrFeNiTi_(0.5)high-entropy alloy coatings were prepared by laser cladding technology on the surface of pure iron,and the phase composition,microstructure,microhardness,wear resistance and wear morphology of the coatings were analyzed using scanning electron microscope,X-ray diffraction,microhardness tester and friction and wear testing machine.Results showed that the phase composition of AlCoCrFeNiTi_(0.5)high-entropy alloy coating included Co_(30Ti,AlFe solid solution phase and Al_(80)Cr_(13)Co_(7)complex phase,presenting a typical network-like spinodal decomposition structure with uniform composition,which was better than the structure of AlCoCrFeNi high-entropy alloy coating.Meanwhile,the average microhardness of the AlCoCrFeNiTi_(0.5)high-entropy alloy coating reached 989 HV_(4.9 N),which was 32%higher than that of AlCoCrFeNi coating,and the wear extent declined by 85%.