冷喷涂辅助感应重熔合成AlCoxCrFeNiCu高熵合金涂层的显微组织和性能  

Microstructure and Properties of AlCo x CrFeNiCu High-Entropy Alloy Coating Synthesized by Cold Spraying Assisted Induction Remelting

作　　者：冯力[1,2] 王贵平 马凯 杨伟杰 安国升[1,2] 李文生[1,2] FENG Li;WANG Guiping;MA Kai;YANG Weijie;AN Guosheng;LI Wensheng(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《金属学报》2023年第5期703-712,共10页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目No.52075234;国家重点研发计划项目No.2016YFE0111400。

摘　　要：通过冷喷涂辅助感应重熔技术在45钢基体成功制备AlCo_(x)CrFeNiCu(x=0、0.5、1.0、1.5、2.0,摩尔分数)高熵合金涂层。研究了Co元素含量对冷喷涂辅助合成高熵合金涂层物相、微观组织的影响。结果表明:通过低压冷喷涂辅助感应重熔技术合成的AlCo_(x)CrFeNiCu高熵合金涂层由fcc+bcc双相混合结构组成,涂层组织为等轴树枝晶+晶间组织,其中枝晶为bcc结构,晶间组织为fcc结构。Co含量的变化会引起AlCo_(x)CrFeNiCu高熵合金涂层的晶格畸变状态发生变化,当x=1.0时,AlCo_(1)CrFeNiCu高熵合金涂层的晶格应变最大。Co元素含量增加会促进AlCo_(x)CrFeNiCu高熵合金涂层中的枝晶数目增加,同时涂层中的树枝晶尺寸也随着Co元素含量增加而增大。涂层中的树枝晶富集Fe、Cr、Co、Ni元素,枝晶间富集Cu元素,Al均匀地分布在整个涂层中。随着Co含量增加,AlCo_(x)CrFeNiCu高熵合金涂层的硬度先增加后减小;当x=1.0时,AlCo_(1)CrFeNiCu高熵合金涂层的硬度达到562.5 HV,此时涂层的摩擦系数最小,为0.352。High-entropy alloy coatings have a very wide range of industrial applications due to their outstanding mechanical properties and good wear resistance.High-entropy alloy coatings of AlCo_(x)CrFeNiCu(x=0,0.5,1.0,1.5,2.0,mole fraction)on 45 steel substrates were successfully produced by cold spraying assisted induction remelting approach.The effect of Co content on the phase and microstructure of cold spraying-assisted high-entropy alloy coating was investigated.The findings reveal that the AlCo_(x)-CrFeNiCu high-entropy alloy coating produced using low-pressure cold spraying assisted induction remelting technique comprises of fcc+bcc two-phase mixed structure,with an equiaxed dendrite+interdendritic structure,with the dendrite being bcc and the interdendritic structure being fcc.The lattice distortion state of AlCo_(x)CrFeNiCu high-entropy alloy coating changes as the Co element changes;when x=1.0,the lattice strain of AlCo_(1)CrFeNiCu high-entropy alloy coating is the largest.Increases in Co content promote an increase in dendrite number in AlCo_(x)CrFeNiCu high-entropy alloy coatings,as well as dendrite.The EDS analysis demonstrated that Fe,Cr,Co,and Ni were enriched in the dendrite,Cu was enriched in the interdendrite,and Al was evenly distributed throughout the coating.With an increase in Co content,the hardness of AlCo_(x)CrFeNiCu high-entropy alloy coating increases first and then decreases.When x=1.0,the hardness of the AlCo_(1)CrFeNiCu high-entropy alloy coating is 562.5 HV,and the coating minimum's friction coefficient is 0.352.

关 键 词：冷喷涂 感应重熔 高熵合金涂层 摩擦磨损 

分 类 号：TG146[一般工业技术—材料科学与工程]