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<p>To address the decline in strength of TiAl joints caused by brittle intermetallic compounds, this study used a novel brazing filler metal. An electric arc melting process was employed. A certain amount of Ta was added to the Ti-Zr-Ni-Cu filler metal. A novel Ti-Zr-Ni-Cu-Ta filler metal was thus fabricated. SEM, EDS, XRD, and shear tests were then conducted. This study investigated how brazing temperatures (940–1000 ℃) and holding times (5–40&#xa0;min) affect the microstructure and mechanical behavior of TiAl alloy joints. Results revealed that the novel filler metal produced effective brazed joints. The joint microstructure consisted of three distinct regions: α₂(Ti₃Al) + γ-(Ti, Zr)₂(Cu, Ni)/γ-(Ti, Zr)₂(Cu, Ni) + α-Ti + α₂(Ti₃Al)/α₂(Ti₃Al) + γ-(Ti,Zr)₂(Cu,Ni). When the brazing temperature and holding time increased, the brazed seam’s width gradually expanded. The highest shear strength was 274&#xa0;MPa, achieved at a brazing temperature of 980 ℃ with a holding time of 20&#xa0;min. Fracture analysis indicated that cracks spread along α-Ti and γ-(Ti, Zr)₂(Cu, Ni). The fracture surfaces revealed brittle features. This study offers useful research methods and insights for developing TiAl alloy brazing technology.</p>

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Microstructures and mechanical properties analysis of TiAl joints using novel brazing filler metal

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Gengyu Zhang,
  • Junjie Gu,
  • Haichuan Shi,
  • Peilei Zhang,
  • Zhishui Yu,
  • Weiping Zhao,
  • Xiaobo Yuan,
  • Liang Zhang,
  • Guowei Yang

摘要

To address the decline in strength of TiAl joints caused by brittle intermetallic compounds, this study used a novel brazing filler metal. An electric arc melting process was employed. A certain amount of Ta was added to the Ti-Zr-Ni-Cu filler metal. A novel Ti-Zr-Ni-Cu-Ta filler metal was thus fabricated. SEM, EDS, XRD, and shear tests were then conducted. This study investigated how brazing temperatures (940–1000 ℃) and holding times (5–40 min) affect the microstructure and mechanical behavior of TiAl alloy joints. Results revealed that the novel filler metal produced effective brazed joints. The joint microstructure consisted of three distinct regions: α₂(Ti₃Al) + γ-(Ti, Zr)₂(Cu, Ni)/γ-(Ti, Zr)₂(Cu, Ni) + α-Ti + α₂(Ti₃Al)/α₂(Ti₃Al) + γ-(Ti,Zr)₂(Cu,Ni). When the brazing temperature and holding time increased, the brazed seam’s width gradually expanded. The highest shear strength was 274 MPa, achieved at a brazing temperature of 980 ℃ with a holding time of 20 min. Fracture analysis indicated that cracks spread along α-Ti and γ-(Ti, Zr)₂(Cu, Ni). The fracture surfaces revealed brittle features. This study offers useful research methods and insights for developing TiAl alloy brazing technology.