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<p>The reliable combination of Ti<sub>2</sub>AlNb alloy with Ti matrix composites (TMCs) is critical for promoting their utilization in the aerospace field. In this work, the TiZrHfNiCu high-entropy amorphous filler foil was employed to braze the TMCs and Ti<sub>2</sub>AlNb alloy. The evolution of the microstructure and mechanical characteristics of the joints under varied temperatures for 10&#xa0;min was studied. The formation mechanism of the joints was illustrated and the inherent relationship between the microstructure and the bonding strength was also established. The results show that all the joints obtained at different temperatures consist of three zones. At 940&#xa0;°C, the microstructure of the joint can be characterized as: (α + β)-Ti, (Ti, Zr, Hf)<sub>2</sub>(Ni, Cu) with traces of TiB and Y<sub>2</sub>O<sub>3</sub> (for the zone I)/continuous (Ti, Zr, Hf)<sub>2</sub>(Ni, Cu) with minor (α + β)-Ti (for the zone II)/continuous B<sub>2</sub> layer with a little O phase (for the zone III). In such a case, the highest shear strength of the joint was obtained, reaching 206.1&#xa0;MPa. When brazed at 910&#xa0;°C, the Ti–rich reaction layer formed at the zone I/zone II interface led to early fracture of the joint. While increasing the brazing temperature over 970&#xa0;°C, the β-Ti and minor IMCs would be formed in zone III, deteriorating the joint strength. The work realized the sound joining between TMCs and Ti<sub>2</sub>AlNb alloys, paving the way for their more extensive application in the aviation field.</p>

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Brazing of Ti2AlNb and TMCs using the amorphous TiZrHfNiCu high-entropy filler alloy

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Duo Dong,
  • Lin He,
  • Dongdong Zhu,
  • Ye Wang,
  • Ning Fang,
  • Man Zhang,
  • Yongde Huang,
  • Kerui Peng,
  • Haitao Xu,
  • Liu Zhu

摘要

The reliable combination of Ti2AlNb alloy with Ti matrix composites (TMCs) is critical for promoting their utilization in the aerospace field. In this work, the TiZrHfNiCu high-entropy amorphous filler foil was employed to braze the TMCs and Ti2AlNb alloy. The evolution of the microstructure and mechanical characteristics of the joints under varied temperatures for 10 min was studied. The formation mechanism of the joints was illustrated and the inherent relationship between the microstructure and the bonding strength was also established. The results show that all the joints obtained at different temperatures consist of three zones. At 940 °C, the microstructure of the joint can be characterized as: (α + β)-Ti, (Ti, Zr, Hf)2(Ni, Cu) with traces of TiB and Y2O3 (for the zone I)/continuous (Ti, Zr, Hf)2(Ni, Cu) with minor (α + β)-Ti (for the zone II)/continuous B2 layer with a little O phase (for the zone III). In such a case, the highest shear strength of the joint was obtained, reaching 206.1 MPa. When brazed at 910 °C, the Ti–rich reaction layer formed at the zone I/zone II interface led to early fracture of the joint. While increasing the brazing temperature over 970 °C, the β-Ti and minor IMCs would be formed in zone III, deteriorating the joint strength. The work realized the sound joining between TMCs and Ti2AlNb alloys, paving the way for their more extensive application in the aviation field.