铝材表面激光熔覆Ni_(1.5)Co_(1.5)FeCrTi_x高熵合金层的组织与性能

Microstructure and Properties of Laser Cladding Ni_(1.5)Co_(1.5)FeCrTi_x High Entropy Alloy Coating on Al Substrate

为了提高铝合金的耐磨性及耐蚀性并降低高熵合金中元素偏析的现象,采用CO_2激光熔覆技术在铝基体表面制备了Ni_(1.5)Co_(1.5)FeCrTi_x高熵合金熔覆层。借助光学显微镜、扫描电镜、X射线衍射仪和电化学工作站检测技术研究了Ti含量对Ni_(1.5)Co_(1.5)FeCrTi_x熔覆层显微组织和耐蚀性能的影响。结果表明:Ni_(1.5)Co_(1.5)FeCrTi_x高熵合金熔覆层主要相结构为简单的面心立方相、金属间化合物相和Laves相;当Ti含量摩尔比从0.5增至2.0时,Ni_(1.5)Co_(1.5)FeCrTi_x高熵合金熔覆层的表面硬度从510 HV增加到554 HV,在0.5 mol/L HNO_3溶液中具有优异的耐蚀性能。

Ni1.5Co1.5FeCrTix coating was prepared on A1 alloy by C02-1aser cladding method.Optical microscope,scanning electron microscope,X-ray diffractometer and electrochemical workstation were used to study the effect of Ti content on the microstructure and corrosion resistance of the coatings.Results showed that the structure of Ni1.5Co1.5FeCrTix high entropy alloy coating was mainly composed of face center cubic phase,intermetallic compound phase and Laves phase.When the Ti content （molar ratio） increased from 0.5 to 2.0,the hardness of Ni1.5Co1.5FeCrTix increased from 510 HV to 554 HV.Besides,the Ni1.5Co1.5FeCrTix high entropy alloy coating possessed excellent corrosion resistance in 0.5mol/L HNO3 solution.