激光熔覆Ti_(3)V_(2)Nb基轻质高熵合金涂层耐磨性能的研究  

Study on wear resistance of laser cladding Ti 3V 2Nb based on lightweight high entropy alloy coatings

作　　者：陈月明 肖华强[1] 林波[1] 莫太骞 CHEN Yueming;XIAO Huaqiang;LIN Bo;MO Taiqian(College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学机械工程学院,贵阳550025

出　　处：《激光技术》2024年第6期891-899,共9页Laser Technology

基　　金：国家自然科学基金资助项目(52065009);贵州省科技计划资助项目(黔科合基础-ZK[2022]一般204)。

摘　　要：为了制备具有合适微观结构和优异性能的轻质高熵合金(LHEA),采用激光熔覆技术在TC4基体上制备了不同Al、Ni物质的量比的Ti_(3)V_(2)NbAl_(x)Ni_(y)LHEA,对其微观结构及其摩擦磨损性能进行研究,并分析了添加微量MoB陶瓷颗粒对其组织性能的影响。结果表明,Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)、Ti_(3)V_(2)NbAl_(0.5)、Ti_(3)V_(2)NbNi_(0.5)涂层的物相由单一体心立方晶体(BCC)组成,而Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)/MoB涂层则形成了第2相A15相;相对基体的硬度,4种涂层的硬度均有提升;4种涂层的磨损形式主要为黏着磨损,磨痕内分布有黏着层与少量氧化层,此外也在磨痕内观察到轻微的磨粒磨损产生的犁沟特征,相对于基体的磨损率均有较大降低,其中Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)/MoB涂层的磨损率降低了51.1%。所制备的LHEA耐磨性好,可作为航空航天、国防设备制造等领域中TC4零件的保护性涂层。In order to prepare lightweight high entropy alloy(LHEA)with suitable microstructure and excellent properties,Ti_(3)V_(2)NbAl_(x)Ni_(y)LHEA with different Al and Ni ratios were prepared on TC4 substrate using laser cladding technology.Its microstructure,friction,and wear properties were studied,and the effect of adding a small amount of MoB ceramic particles on its microstructure and properties was discussed.The results show that the phases of Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5),Ti_(3)V_(2)NbAl_(0.5)and Ti_(3)V_(2)NbNi_(0.5)coatings are composed of a single body-centered cubic crystal(BCC),while the second phase A1_(5)is formed in Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)/MoB coatings.Compared with the hardness of the matrix,the hardness of four coatings has been improved.The wear forms of four coatings are mainly adhesive wear,with adhesive layer and a small amount of oxide layer distributed in the wear marks,and furrow characteristics caused by slight abrasive wear are also observed in the wear marks.Compared with the matrix,the wear rate of Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)/MoB coating is greatly reduced,and the wear rate of Ti_(3)V_(2)NbAl_(0.5)Ni_(0.5)/MoB coating is reduced by 51.1%.The LHEA in this paper has good wear resistance and can be used as a protective coating for TC4 parts in aerospace,national defense equipment manufacturing and other fields.

关 键 词：激光技术 轻质高熵合金 激光熔覆 固溶强化 硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]