添加硼元素对Ni-25at%Si/Ti600接头组织性能的影响规律  

Effect of adding boron element on microstructure and shear strength of Ni-25at%Si/Ti600 joint

作　　者：李晓鹏 韩瑞 钱旭升 张秉刚[2] 王克鸿[1] LI Xiaopeng;HAN Rui;QIAN Xusheng;ZHANG Binggang;WANG Kehong(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150006,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150006

出　　处：《航空学报》2022年第2期75-84,共10页Acta Aeronautica et Astronautica Sinica

基　　金：中国博士后科学基金(2020M682928);稳定支持项目(WDZC2020JJ021)。

摘　　要：以高温钛合金和自共晶镍硅合金为母材,使用额外添加硼元素的Ti-Zr-Ni-Cu非晶钎料进行钎焊连接,针对硼元素含量和钎焊对接头界面结构和力学性能的影响进行探究。通过对Ni-25at%Si/Ti-Zr-Ni-Cu+B非晶钎料/Ti600接头的界面组织结构进行优化实现钎焊结构性能的提升,获得质量良好的钎焊接头。研究结果表明,通过引入硼元素可调控钎焊过程,继而获得TiB晶须,这种晶须能对Ti;Ni层产生复合强化的作用,进而使接头高温钛合金侧界面的残余应力明显下降,减缓接头开裂的速度,同时结合拔出强化方式对裂纹的扩展起到阻碍作用,从而提高接头的强度。1213 K/10 min工艺条件下的镍硅合金/高温钛合金钎焊接头的平均强度高于不含硼元素增强的接头,达到84 MPa,同时确保在接头内部不会出现裂纹和孔洞,进而达到提升镍硅合金/高温钛合金钎焊接头质量的效果。The Ti-Zr-Ni-Cu amorphous brazing filler metal with added boron element was used to braze high temperature titanium alloy and self eutectic silicon nickel alloy,and the effects of boron element content and brazing process on the interface structure and mechanical properties of the joint were explored.The interface structure of Ni-25 at%Si/Ti-Zr-Ni-Cu+B amorphous brazing filler metal/Ti600 brazing joints was optimized to obtain higher performance joints.The research results show that by introducing boron element to metallurgically control the brazing process,TiB whiskers were obtained,which can produce compound strengthening effect on the Ti;Ni layer,significantly reduce the residual stress at the Ti600 side interface of the joint,delay crack,hinder crack propagation of the joint by pull-out strengthening,and thus improve the strength of the joint.The average strength of the Ni-25 at%Si/Ti600 brazing joint under the 1213 K/10 min process conditions was increased to 84 MPa,and there were no cracks and holes inside the joint.Quality of the Si-Ni alloy/high temperature titanium alloy brazing joint was successfully improved.

关 键 词：钎焊 TI600合金 Ni-25at%Si合金 硼元素 界面组织 力学性能 

分 类 号：V45[一般工业技术—材料科学与工程] TG454[金属学及工艺—焊接]