强流脉冲电子束作用下CrFeCoNiMo_(0.2)的组织结构与性能调控  

Microstructure and Performance Control of CrFeCoNiMo_(0.2)under Action of High Current Pulsed Electron Beam

作　　者：吕鹏[1] 刘子剑 彭韬 蔡杰[2] 张从林 关庆丰[1] Lv Peng;Liu Zijian;Peng Tao;Cai Jie;Zhang Conglin;Guan Qingfeng(College of Material Science and Technology,Jiangsu University,Zhenjiang 212013,China;Engineering Institute of Advanced Manufacturing and Modern Equipment Technology,Jiangsu University,Zhenjiang 212013,China;School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013 [3]盐城工学院材料科学与工程学院,江苏盐城224051

出　　处：《稀有金属》2023年第9期1221-1231,共11页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51601071);国家自然科学基金-青年基金项目(51601072);江苏省自然科学基金-青年基金项目(BK20160530);江苏大学青年英才培育计划项目;江苏省博士后科研资助计划项目(2018K025B);江苏省研究生科研实践创新项目(KYCX18-2236)资助。

摘　　要：利用强流脉冲电子束(HCPEB)对真空非自耗电弧熔炼法制备的CrFeCoNiMo_(0.2)高熵合金(HEA)表面进行辐照处理,通过各种表征和测试手段考察HCPEB辐照对样品表面的相结构、微观形貌以及性能的影响,并总结和探究了材料表面性能的强化机制。结果表明,CrFeCoNiMo_(0.2)合金主相为面心立方(fcc)结构,被辐照样品的表面在(111)上表现出择优取向。此外,经HCPEB辐照后,原始合金表面发生重熔并形成熔坑,熔坑密度随着辐照次数的增加而逐渐降低,合金表面随着辐照次数的增加趋于平整、光滑。HCPEB辐照处理还会诱发合金表面产生大量存在一定夹角的滑移带,位错在密排面{111}上沿原子最密集方向<110>晶向进行滑移。同时,HCPEB辐照促进了合金表面成分趋于均匀化、晶粒细化和致密的重熔层的产生,且其厚度随辐照次数的增加而增加。透射电镜(TEM)结果表明,HCPEB辐照诱发合金表面产生了纳米级σ析出相以及亚晶、位错、位错胞等亚结构。性能测试结果表明,电子束辐照后合金表面的硬度值和耐磨性显著提高。With rapid development and innovation in the technical fields of equipment manufacturing,aerospace and energy engineering in our country,the industrial market requirements for the preparation of engine and mechanical parts materials have become more and more stringent.As a newly developed hot material,high-entropy alloy(HEA)is able to adapt various harsh industrial service environments.However,there are some certain defects in its preparation process,which seriously deteriorate the performance of the alloy.Therefore,this article applies surface technology to modify HEA to improve its properties.Used high-current pulsed electron beam(HCPEB)to irradiate the surface of CoCrFeNiMo_(0.2)HEA prepared by vacuum non-consumable arc smelting.Used X-ray diffraction(XRD),optical microscope(OM),scanning election microscope(SEM),transmission electron microscope(TEM)and other characterization methods to investigate the influence of HCPEB irradiation on the phase structure and micro-morphology of the sample surface.Subsequently,the microhardness value of the sample surface before and after irradiation was tested and the wear mechanism was analyzed.Thereby,the strengthening mechanism of the surface performance of the material could be summarized and explored,and the inner relationship among the surface,the microstructure and the surface performance of the irradiated alloy could be established.The results of XRD analysis showed that the main phase of CrFeCoNiMo_(0.2)alloy was face center cubic(fcc)structure,and the surface of the irradiated sample showed a preferred orientation on(111).The metallographic morphology showed that after irradiated by HCPEB,the surface of CrFeCoNiMo_(0.2)alloy remelted,and erupted to form a volcanic crater-like morphology,that was,melting crater,and the density of the crater gradually decreased with the increment of irradiation pulse number,which meant these pit defects were ablated and repaired under the action of multiple pulses.The micro-morphology showed that the surface of the alloy tended to be f

关 键 词：强流脉冲电子束(HCPEB) CrFeCoNiMo_(0.2)高熵合金(HEA) 表面改性 微观结构 显微硬度 磨损行为 

分 类 号：TG178[金属学及工艺—金属表面处理]