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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (2): 625069.doi: 10.7527/S1000-6893.2021.25069

• Special Topic of Advanced Aeronautical Materials Welding/Joining • Previous Articles     Next Articles

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

LI Xiaopeng1, HAN Rui1, QIAN Xusheng1, ZHANG Binggang2, WANG Kehong1   

  1. 1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
    2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150006, China
  • Received:2020-12-07 Revised:2021-01-04 Published:2021-03-09
  • Supported by:
    China Postdoctoral Science Foundation (2020M682928); Stable Support Project (WDZC2020JJ021)

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-25at%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-25at%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.

Key words: braze welding, Ti600 alloy, Ni-25at%Si alloy, boron element, interfacial microstructure, mechanical property

CLC Number: