【摘要】 为了提高铝合金表面的力学和耐腐蚀性能,利用激光沉积技术在铝合金表面制备了AlCrFeCoNiCu高熵合金涂层。使用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、能谱分析仪（EDS）、显微硬度计和电化学工作站,研究了涂层的相结构、微观组织、元素分布、硬度及耐腐蚀性能。结果表明,涂层与基材结合良好,基材中Al元素在熔池搅拌作用下上浮,使沉积层呈FCC相和BCC相;显微组织为典型的枝晶结构,Cu元素在枝晶间富集;涂层平均显微硬度为528HV_0.2,约是基材的5倍;AlCrFeCoNiCu涂层在3.5% NaCl溶液中的腐蚀特征为点蚀和晶间腐蚀,耐腐蚀性优于基材。激光沉积制备的AlCrFeCoNiCu高熵合金可以改善铝合金表面性能。更多还原

【Abstract】 To improve the mechanical and corrosion resistance of an aluminum alloys,laser deposition（ LDP）was used to form an Al CrFeCoNiCu high-entropy alloy（ HEA） coating on an aluminum alloy surface. The phase structure,microstructure,micro-hardness and corrosion resistance of the HEA coating were investigated using X-ray diffraction（ XRD）,scanning electronic microscopy with energy-dispersive spectroscopy（ SEMEDS）,a microhardness tester and an electrochemical workstation. The experiment revealed that the coating had excellent adhesion to the substrate. The HEA coating consisted of body-centered cubic（ BCC） and facecentered cubic（ FCC） phases,while the microstructure was shown to be a typical dendritic structure. The coating had an average micro hardness of 528Hv_0.2,which is five times greater than that of the substrate. Corrosion of the samples was shown to be pitting and intercrystalline corrosion in a 3. 5% NaCl solution,and the corrosion resistance was superior to that of the substrate. Thus,Al CrFeCoNiCu HEA coating has been demonstrated to be an effective way of improving the surface properties of aluminum alloys.更多还原