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<p>Achieving the brazing of CoCrNi medium-entropy alloy and Ti<sub>2</sub>AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr <i>γ</i> + <i>γ</i> + <i>σ</i>/TiNi + TiNi<sub>3</sub> + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti<sub>2</sub>Ni(Al, Nb) + (Ti, Zr)<sub>2</sub>(Ni, Cu, Co)/<i>β</i>/Ti<sub>2</sub>AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)<sub>2</sub>(Ni, Cu, Co) in the joint decreases while the content of <i>β</i> phase increases. However, the concentration of (Ti, Zr)<sub>2</sub>(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)<sub>3</sub> and (Ti, Nb)<sub>ss</sub> under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040&#xa0;°C/10&#xa0;min. The joints mainly fracture at (Ti, Zr)<sub>2</sub>(Ni, Cu, Co), Ti<sub>2</sub>Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti<sub>2</sub>Ni(Al, Nb) and (Ti, Zr)<sub>2</sub>(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.</p>

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Investigation on Microstructure and Mechanical Properties of CoCrNi/Ti2AlNb Joints Brazed with Ti-Based Amorphous Filler

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Xiaochen Li,
  • Jingxin Xu,
  • Guanheng Han,
  • Wei Fu,
  • Yanyu Song,
  • Yu Lei,
  • Xiaoguo Song,
  • Fei Long,
  • Shengpeng Hu

摘要

Achieving the brazing of CoCrNi medium-entropy alloy and Ti2AlNb alloy is of great significance for the fabrication of complex high-temperature resistant components in aero-engines. In this study TiZrNiCu filler was used to realize the brazing of the two alloys. The typical interfacial microstructure of the brazed joint is CoCrNi/rich-Cr γ + γ + σ/TiNi + TiNi3 + Cr + σ/(Ti, Zr)(Ni, Cu)/Ti(Co, Ni)/Ti2Ni(Al, Nb) + (Ti, Zr)2(Ni, Cu, Co)/β/Ti2AlNb. With the increase of brazing temperature and holding time, the content of (Ti, Zr)2(Ni, Cu, Co) in the joint decreases while the content of β phase increases. However, the concentration of (Ti, Zr)2(Ni, Cu, Co) increases again accompanied by the formation of new phases such as Ti(Co, Ni)3 and (Ti, Nb)ss under extremely high brazing parameters. The joint reaches the highest strength under the parameter of 1040 °C/10 min. The joints mainly fracture at (Ti, Zr)2(Ni, Cu, Co), Ti2Ni(Al, Nb) as well as (Ti, Zr)(Ni, Cu) and Ti(Co, Ni), presenting a cleavage fracture mode. Combined with nanoindentation tests, Ti2Ni(Al, Nb) and (Ti, Zr)2(Ni, Cu, Co) have the lowest plasticity factors among all phases in the joint, which are prone to cause failure.