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LI Peng, ZHANG Zhenyang, ZHANG Liangliang, MA Xiong, SUN Bingbing, LI Chao, DONG Honggang. Vacuum brazing Ti2AlNb / GH4169 alloy with (TiZrHf)40(NiCu)55Al5 high-entropy amorphous filler metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(8): 1-11. DOI: 10.12073/j.hjxb.20230821001
Citation: LI Peng, ZHANG Zhenyang, ZHANG Liangliang, MA Xiong, SUN Bingbing, LI Chao, DONG Honggang. Vacuum brazing Ti2AlNb / GH4169 alloy with (TiZrHf)40(NiCu)55Al5 high-entropy amorphous filler metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(8): 1-11. DOI: 10.12073/j.hjxb.20230821001
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Vacuum brazing Ti2AlNb / GH4169 alloy with (TiZrHf)40(NiCu)55Al5 high-entropy amorphous filler metal

  • 1.

    School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

  • 2.

    Beijing Cisri-Gaona Materials & Technology Co., Ltd., Beijing, 100081, China

  • 3.

    AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, China

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  • Received Date: August 20, 2023
  • Available Online: June 23, 2024
    Graphical Abstract
    • Abstract

  • A high-entropy amorphous brazing filler metal (TiZrHf)40(NiCu)55Al5 was designed for vacuum brazing of Ti2AlNb alloy and GH4169 nickel-based superalloy. The effects of brazing parameters on the interfacial microstructure, mechanical properties and fracture behavior of Ti2AlNb alloy/GH4169 nickel-based superalloy brazed joints were studied. The results showed that the brazed joints can be divided into Ti2AlNb/ diffusion reaction zone (zone I)/brazing seam center zone (zone II)/diffusion reaction zone (zone III)/GH4169. The typical interface microstructure of brazed joints was Ti2AlNb/B2 + Ti2Ni(Al, Nb)/(Ti, Zr, Hf)(Ni, Cu)/(Ni, Cr, Fe, Ti)ss + Cr-rich (Ni, Cr, Fe)ss + Ni-rich(Ni, Cr, Fe)ss + (Ni, Cr, Fe)ss/GH4169.With the increase of brazing temperature and brazing time, the shear strength of brazed joints increased first and then decreased. When the brazing temperature was 1020 ℃ and the brazing time was 15 min, the maximum shear strength of 237 MPa was obtained. The fracture analysis showed that the joint was mainly broken at zone of Ti2Ni(Al, Nb) + (Ti, Zr, Hf) (Ni, Cu) + (Ni, Cr, Fe, Ti)ss, and fracture path gradually expanded to the diffusion reaction zone. The fracture morphology showed typical cleavage fracture characteristics.

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