飞秒激光表面织构化对CFRP/2060铝锂合金高速激光连接接头剪切性能的影响  

Effect of Femtosecond Laser Surface Texturing on Shear Properties of High-Speed Laser Joined CFRP and 2060 Al-Li Alloy

作　　者：王栋[1] 徐洁洁[1] 黄婷[1] 景若木 张景泉 肖荣诗[1] WANG Dong;XU Jiejie;HUANG Ting;JING Ruomu;ZHANG Jingquan;XIAO Rongshi(High-Power and Ultrafast Laser Manufacturing Lab,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部智能光子制造研究中心,北京100124

出　　处：《航空制造技术》2024年第5期89-94,102,共7页Aeronautical Manufacturing Technology

基　　金：北京市教委科技重点资助项目(KZ202010005011)。

摘　　要：激光表面织构化作为提高异质结构接头剪切性能的有效手段,已广泛应用于碳纤维增强复合材料(CFRP)与金属材料激光连接领域中。采用波长515 nm的飞秒激光在2060铝锂合金表面制备微结构,采用能量密度分布均匀的矩形光斑实现CFRP和2060铝锂合金异质接头的高速光纤激光连接,探讨飞秒激光刻蚀深度、扫描线间距对异质结构接头剪切强度的影响规律。结果表明,通过飞秒激光织构化处理,异质接头剪切强度得到了大幅提升,接头破坏形式均为界面断裂和基体断裂的混合断裂模式。在激光功率5 kW、焊接速度高达3.6 m/min条件下,接头平均剪切强度可达35.7 MPa,是未经飞秒激光织构化接头的2.3倍。Laser surface texturing is an effective method to improve the shear strength of the dissimilar joints,and has been widely used in laser joining CFRP to metal.In this work,a femtosecond laser with a wavelength of 515 nm was used to fabricate microstructure on the surface of 2060 Al–Li alloy.And on this basis,high-speed fiber laser joining of CFRP to 2060 Al–Li alloy was realized by a rectangular beam spot,which could provide a relatively uniform energy density.The influence of ablated depth of the microstructure and the scanning line space on the shear strength of dissimilar joints was investigated.The results indicate that the shear strength of the dissimilar joints is greatly improved through femtosecond laser texturing.All the dissimilar joints fail with the mixed failure mode composed of the CFRP matrix fracture and interface fracture.Remarkably,the average shear strength of the dissimilar joints is 35.7 MPa at a relatively high welding velocity of 3.6 m/min and a laser power of 5 kW,which is 2.3 times that of the joint without femtosecond laser texturing.

关 键 词：碳纤维增强复合材料(CFRP) 2060铝锂合金 飞秒激光织构化 激光连接 剪切强度 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]