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<p>The tendency to form brittle intermetallic compounds precludes the fusion welding of beryllium to stainless steel. To overcome this, brazing with an AgCuTi filler metal was employed, fabricating joints at 850&#xa0;°C and 920&#xa0;°C for 30&#xa0;min. The results demonstrate that brazing temperature is a critical governing parameter. At 920&#xa0;°C, excellent wettability produced nearly pore-free joints and promoted copper-beryllium interdiffusion, forming a continuous 10–30&#xa0;μm thick Be<sub>2</sub>Cu layer. In contrast, brazing at 850&#xa0;°C resulted in poor fluidity and severe porosity. The joints brazed at 920&#xa0;°C achieved a shear strength of 42–48&#xa0;MPa, with failure initiating at the Be/Be<sub>2</sub>Cu layer interface. This work demonstrates the viability of brazing as an effective solution for joining beryllium to stainless steel.</p>

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Microstructure and mechanical properties of the beryllium-stainless steel joints processed by brazing technique

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Zuoyong Dou,
  • Xinggen Guo,
  • Ce Ma,
  • Fangfang Li,
  • Shiming Wen,
  • Xianglin Chen,
  • Shengquan Xia,
  • Yubin Li

摘要

The tendency to form brittle intermetallic compounds precludes the fusion welding of beryllium to stainless steel. To overcome this, brazing with an AgCuTi filler metal was employed, fabricating joints at 850 °C and 920 °C for 30 min. The results demonstrate that brazing temperature is a critical governing parameter. At 920 °C, excellent wettability produced nearly pore-free joints and promoted copper-beryllium interdiffusion, forming a continuous 10–30 μm thick Be2Cu layer. In contrast, brazing at 850 °C resulted in poor fluidity and severe porosity. The joints brazed at 920 °C achieved a shear strength of 42–48 MPa, with failure initiating at the Be/Be2Cu layer interface. This work demonstrates the viability of brazing as an effective solution for joining beryllium to stainless steel.