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宋晓国,司晓庆,曹健,王志权,赵洪运,冯吉才.高铌TiAl合金钎焊接头组织和性能研究[J].稀有金属材料与工程(英文),2018,47(1):52~58.[X.G. Song,X.Q. Si,J. Cao,Z.Q. Wang,H.Y. Zhao,J.C. Feng.An investigation on microstructure and joining properties of high Nb-containing TiAl alloy brazed joints[J].Rare Metal Materials and Engineering,2018,47(1):52~58.]
An investigation on microstructure and joining properties of high Nb-containing TiAl alloy brazed joints
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Received:November 23, 2016  Revised:November 23, 2016
DOI:
Key words: TiAl intermetallic  Brazing  Microstructure  Mechanical properties  Fracture
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Author NameAffiliationE-mail
X.G. Song State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology songxiaoguohit@sohu.com 
X.Q. Si State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology  
J. Cao State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology  
Z.Q. Wang State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology  
H.Y. Zhao State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology  
J.C. Feng State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology  
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Abstract:
      High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at.%), abbreviated as TAN alloy) was successfully brazed at 1100 °C using Ti-28Ni (wt.%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni + B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated in detail. The results demonstrated that the diffusion of Ni from molten brazing alloy to TAN substrate played an important role in the interfacial microstructure evolution, which resulted in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicated that the maximum shear strength at room temperature and high temperature (600 °C) reached 248.6 MPa and 166.4 MPa respectively when holding time was 15 min. Fracture analyses revealed that brittle fracture preferred to initiate and propagate in the continuous intermetallic layers during shear test.