激光涂覆车用CrFeNiCoMnMo_(0.5)高熵合金涂层组织、纳米压痕行为及磨损行为  

Microstructure,Nanoindentation Behavior and Wear Behavior of Laser Coated CrFeNiCoMnMo_(0.5) High Entropy Alloy Coatings

作　　者：李海波 赵璐 刘云霞 马艳美 Li Haibo;Zhao Lu;Liu Yunxia;Ma Yanmei(Hebei Mechanical and Electrical Engineering Technician College,Zhangjiakou 075000,Hebei,China;Shenyang Institute of Engineering,Shenyang 110870,Liaoning,China)

机构地区：[1]河北省机电工程技师学院,河北张家口075000 [2]沈阳工程学院,辽宁沈阳110870

出　　处：《应用激光》2025年第2期114-122,共9页Applied Laser

基　　金：辽宁省教育厅基本科研项目(LJ222411632022);河北省人力资源保障课题(JRSJY-2023-1053)。

摘　　要：采用激光涂覆技术在汽车用40Cr钢表面分别制备CrFeNiCoMnMo_(0.5)和CrFeNiCoMn高熵合金涂层。研究Mo元素的引入对CrFeNiCoMn高熵合金涂层显微组织、相组成、晶体学特性、纳米压痕特性及磨损行为的影响。结果表明:CrFeNiCoMnMo_(0.5)高熵合金涂层的相组成为FCC相和σ相,并且Mo元素的固溶增大了FCC相的晶格畸变,促进了FCC相的固溶强化效应。Mo元素的引入显著提升了高熵合金涂层的纳米硬度,CrFeNiCoMnMo_(0.5)涂层的纳米硬度为7.81 GPa±0.13 GPa,显著优于CrFeNiCoMn涂层。此外,CrFeNiCoMnMo_(0.5)涂层还具有较高的H/E、H^(3)/E^(2)(H为纳米硬度;E为弹性模量),表明涂层具有优异的抗塑性变形能力。由于纳米硬度的提升,CrFeNiCoMnMo_(0.5)涂层具有更为优异的耐磨性,其平均摩擦系数为0.48,比磨损率为2.307×10^(-6) mm^(3)/(N·m)。磨损机理为磨粒磨损、黏着磨损和表面疲劳磨损。CrFeNiCoMnMo_(0.5) and CrFeNiCoMn high-entropy alloy(HEA)coatings were successfully prepared on the surface of automotive steel using laser coating technology.The influence of Mo addition on the microstructure,phase composition,crystallographic properties,nanoindentation characteristics,and wear behavior of the coatings was systematically investigated.The results revealed that the CrFeNiCoMnMo_(0.5) HEA coating comprised an FCC phase and a σ phase.The incorporation of Mo increased lattice distortion within the FCC phase,enhancing its solid solution strengthening effect.Consequently,the nano-hardness of the CrFeNiCoMnMo_(0.5) coating was significantly improved,reaching 7.81 GPa±0.13 GPa,which was markedly higher than that of the CrFeNiCoMn coating.Additionally,the CrFeNiCoMnMo_(0.5) coating exhibited higher H/E and H^(3)/E^(2) ratios,signifying exceptional resistance to plastic deformation.The enhanced nano-hardness resulted in superior wear resistance,with an average friction coefficient of 0.48 and a specific wear rate of 2.307×10^(-6) mm^(3)/(N·m).The primary wear mechanisms were identified as abrasive wear,adhesive wear,and surface fatigue wear.This study underscores the critical role of Mo in improving the mechanical and wear properties of high-entropy alloy coatings for automotive applications.

关 键 词：高熵合金 激光涂覆 纳米压痕 磨损行为 MO 

分 类 号：O436[机械工程—光学工程]