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<p>This study presents the results of metallographic and micro–X-ray spectral investigations of the interfacial boundary between a high-entropy MnCoNiCuGe₅ brazing filler metal and base materials after spreading on nickel (Ni), corrosion-resistant steel 12Kh18N10T, and the heat-resistant nickel-based superalloy IN718. Micro–X-ray spectral analysis confirmed that, after spreading on nickel, a two-phase structure is formed that is close to the initial structure of the two-phase high-entropy filler metal. This structure consists of a nickel-based solid solution and a germanium-enriched phase. When spreading on the heat-resistant IN718 alloy, in addition to these phases, a third phase crystallizes in which the germanium concentration increases to 21.37%. During capillary vacuum brazing of steel and the IN718 alloy in narrow gaps, a heterogeneous structure with zonal crystallization of the brazed seam metal is observed. In the central zone, besides two solid solutions, discrete isolated inclusions of a germanium-enriched (MnNiCuCo)<sub>100–X</sub>Ge<sub>X</sub> phase are formed. The obtained results demonstrate the influence of the chemical composition of the base metal on the composition and morphological features of brazed seams when using the high-entropy MnCoNiCuGe₅ filler metal, which is characterized by the presence of two solid solutions.</p>

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Structure formation of seams using high-entropic brazing filler metal MnCoNiCuGe5

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月5日

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  • Svitlana Maksymova,
  • Petro Kovalchuk,
  • Vitalii Voronov

摘要

This study presents the results of metallographic and micro–X-ray spectral investigations of the interfacial boundary between a high-entropy MnCoNiCuGe₅ brazing filler metal and base materials after spreading on nickel (Ni), corrosion-resistant steel 12Kh18N10T, and the heat-resistant nickel-based superalloy IN718. Micro–X-ray spectral analysis confirmed that, after spreading on nickel, a two-phase structure is formed that is close to the initial structure of the two-phase high-entropy filler metal. This structure consists of a nickel-based solid solution and a germanium-enriched phase. When spreading on the heat-resistant IN718 alloy, in addition to these phases, a third phase crystallizes in which the germanium concentration increases to 21.37%. During capillary vacuum brazing of steel and the IN718 alloy in narrow gaps, a heterogeneous structure with zonal crystallization of the brazed seam metal is observed. In the central zone, besides two solid solutions, discrete isolated inclusions of a germanium-enriched (MnNiCuCo)100–XGeX phase are formed. The obtained results demonstrate the influence of the chemical composition of the base metal on the composition and morphological features of brazed seams when using the high-entropy MnCoNiCuGe₅ filler metal, which is characterized by the presence of two solid solutions.