Laser joining of CFRTP to titanium alloy via laser surface texturing  

作　　者：Caiwang TAN Jianhui SU Ziwei FENG Yifan LIU Bo CHEN Xiaoguo SONG 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [2]Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihcii 264209,China

出　　处：《Chinese Journal of Aeronautics》2021年第5期103-114,共12页中国航空学报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.51875129)。

摘　　要：Grid pattern was textured on Ti-6 Al-4 V alloy(TC4)substrate surface by nanosecond laser system.Laser joining of carbon fiber reinforced thermoplastic composite(CFRTP)to TC4 joints were performed,and the effect of texture grid depth was investigated.The contact angle of molten CFRTP on textured TC4 surface was measured and the tensile-shear force was tested.The fracture surface and interface morphology were observed.The results indicated that the wettability of molten CFRTP on TC4 surface improved remarkably after laser textured TC4.Shear force of CFRTP/TC4 joints was increased by 156%after laser textured TC4 surface.When the depth of grid was deeper than 100μm,contact angle increased and incomplete filling of molten CFRTP in grid occurred,the shear force thus decreased gradually.Resin-carbon fibers mixture was adhered on the fracture surface of TC4,and the variation tendency of adhesion ratio was consistent with that of shear force.TC4 matrix was exfoliated from substrate and adhered at the fracture surface of CFRTP,indicating stronger mechanical interlocking occurred at the joining interface after laser textured TC4 surface.Beside mechanical interlocking,compound layer consisted of CTi_(0.42)V_(1.58)carburization phase was also confirmed at interface,suggesting that chemical bonding also occurred at the joining interface.

关 键 词：Carbon fiber reinforced thermoplastic composite(CFRTP) Grid depth Laser joining Laser texturing TC4 

分 类 号：TG456.7[金属学及工艺—焊接] V261[航空宇航科学与技术—航空宇航制造工程]