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<p>Underlying the combination design of Cantor alloy and melting-point depressant additions, a Ni-Co-Fe-Mn-Cr-Ge-(Si, B) eight-element high-entropy alloy brazing filler metal was proposed for dissimilar joining of TiAl-based alloy and Ni-based superalloy. The cast brazing filler metal was mainly composed of Cr<sub>2</sub>B, CoNi and Ni<sub>3</sub>Si phases, showing a liquidus temperature of 1108.1 ℃. The filler alloy demonstrated good wettability on both TiAl and GH3536 substrates after being held at 1130 ℃ for 10&#xa0;min. The brazed joint exhibited alternating growth of B2 and α<sub>2</sub>-Ti<sub>3</sub>Al phases, accompanied by the formation of Al<sub>3</sub>NiTi<sub>2</sub> reaction layer, TiB<sub>2</sub> precipitates and AlNi<sub>2</sub>Ti phases at the TiAl/brazing seam interface. At the brazing seam/GH3536 interface, Ti-(Fe, Ni, Cr) intermetallic compounds dissolved with approximately 8 at. % Si, CrFe, Ti-based and Ni-based solid solutions were identified. Under the brazing condition of 1130 ℃/20&#xa0;min, sufficient interdiffusion occurred within the brazed joint, resulting in residual Mn and Ge contents in the brazing seam remaining below 3 at. %. Consequently, the joint offered the maximum shear strength of 275&#xa0;MPa at ambient temperature, and strength values of 241&#xa0;MPa and 229&#xa0;MPa at 750 ℃ and 850 ℃, respectively. However,&#xa0;the joint fracture occurred at the Al<sub>3</sub>NiTi<sub>2</sub>/AlNi<sub>2</sub>Ti interface and presented typical brittle fracture characteristics.</p>

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Dissimilar joining of TiAl alloy to Ni-based superalloy using a Ni-Co-Fe-Mn-Cr-Ge-(Si, B) high-entropy alloy as brazing filler metal

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • Zhiliang Zhai,
  • Xinyu Ren,
  • Haishui Ren,
  • Huaping Xiong,
  • Wenwen Li,
  • Yonglai Shang,
  • Yaoyong Cheng

摘要

Underlying the combination design of Cantor alloy and melting-point depressant additions, a Ni-Co-Fe-Mn-Cr-Ge-(Si, B) eight-element high-entropy alloy brazing filler metal was proposed for dissimilar joining of TiAl-based alloy and Ni-based superalloy. The cast brazing filler metal was mainly composed of Cr2B, CoNi and Ni3Si phases, showing a liquidus temperature of 1108.1 ℃. The filler alloy demonstrated good wettability on both TiAl and GH3536 substrates after being held at 1130 ℃ for 10 min. The brazed joint exhibited alternating growth of B2 and α2-Ti3Al phases, accompanied by the formation of Al3NiTi2 reaction layer, TiB2 precipitates and AlNi2Ti phases at the TiAl/brazing seam interface. At the brazing seam/GH3536 interface, Ti-(Fe, Ni, Cr) intermetallic compounds dissolved with approximately 8 at. % Si, CrFe, Ti-based and Ni-based solid solutions were identified. Under the brazing condition of 1130 ℃/20 min, sufficient interdiffusion occurred within the brazed joint, resulting in residual Mn and Ge contents in the brazing seam remaining below 3 at. %. Consequently, the joint offered the maximum shear strength of 275 MPa at ambient temperature, and strength values of 241 MPa and 229 MPa at 750 ℃ and 850 ℃, respectively. However, the joint fracture occurred at the Al3NiTi2/AlNi2Ti interface and presented typical brittle fracture characteristics.