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<p>High-entropy alloys hold promise as brazing filler metals for achieving high-strength brazing but are limited by high melting point and sluggish diffusion behavior. This study introduces the addition of the Zr element to improve the weldability of high-entropy alloy (HEA) filler. The well-formed nickel-based superalloy joint can be achieved with the proposed filler (HEA-Zr) at relatively low temperature, owing to the activating effect of introduced Zr-rich species. Surprisingly, the brazed seam exhibits a distinctive network-like microstructure, consisting of a Ni-rich solid solution and intergranularly distributed Zr-rich phases. It offers a significant increase in joint shear strength, reaching approximately 635&#xa0;MPa. The mechanisms of forming and strengthening have been discussed in detail, providing novel theoretical insights for the design of high-entropy alloy fillers.</p>

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Brazing of superalloy with Zr-activated CoCrFeNiCu high entropy alloy filler

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Yu Zhang,
  • Wei Guo,
  • Yongxin Zhang,
  • Zhandong Wan,
  • Xingwen Zhou,
  • Hongqiang Zhang

摘要

High-entropy alloys hold promise as brazing filler metals for achieving high-strength brazing but are limited by high melting point and sluggish diffusion behavior. This study introduces the addition of the Zr element to improve the weldability of high-entropy alloy (HEA) filler. The well-formed nickel-based superalloy joint can be achieved with the proposed filler (HEA-Zr) at relatively low temperature, owing to the activating effect of introduced Zr-rich species. Surprisingly, the brazed seam exhibits a distinctive network-like microstructure, consisting of a Ni-rich solid solution and intergranularly distributed Zr-rich phases. It offers a significant increase in joint shear strength, reaching approximately 635 MPa. The mechanisms of forming and strengthening have been discussed in detail, providing novel theoretical insights for the design of high-entropy alloy fillers.