【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Ti₂Ni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。1 213 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。更多还原

【Abstract】 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 Ti₂Ni 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 1 213 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.更多还原