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<p>Driven by demands for lightweight aerospace and corrosion-resistant petrochemical components, this study addresses performance limitations in TiB<sub>2</sub>-reinforced ultrahigh-strength steel matrix composites—notably brittle Fe<sub>2</sub>B phases and poor wettability—through Co/Nb interfacial engineering via mechanical alloying–hot rolling consolidation. Key results demonstrate that: (i) Co suppresses Fe<sub>2</sub>B by forming a lattice-matched (Co, Ti) B transition layer and enhances wettability via <i>γ</i>-Fe solid solution, achieving an effective interfacial transition zone &gt; 10&#xa0;μm; (ii) Nb preferentially forms NbB<sub>2</sub> to block boron diffusion, but excess addition (&gt; 40&#xa0;wt%) induces brittle phases and microcracks; (iii) thermodynamic analysis confirms phase stability of Nb across 0–1600&#xa0;°C, while Co demonstrates optimal performance in 400–1000&#xa0;°C processing. Critically, TiB<sub>2</sub>-reinforced steel matrix composites co-doped with Co/Nb, featuring mechanically alloyed Core-Rim structures (TiB<sub>2</sub>-core/Co-shell spheres and TiB<sub>2</sub>-core/Nb-shell platelets), exhibit breakthrough properties via interfacial enhancement. Interfacial regions achieve 1086&#xa0;MPa tensile strength (109% over matrix) and 835.6 HV hardness, establishing a critical foundation for high-strength laminated composites.</p>

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Study on interfacial bonding mechanisms of Co/Nb-doped TiB2 cermet composites by mechanical alloying

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Ertai Lei,
  • Xuejiao Zhou,
  • Yongli Chen,
  • Yuntao Yang,
  • Huan Yang,
  • Shuo Xiang,
  • Donghai He,
  • Xin Yang

摘要

Driven by demands for lightweight aerospace and corrosion-resistant petrochemical components, this study addresses performance limitations in TiB2-reinforced ultrahigh-strength steel matrix composites—notably brittle Fe2B phases and poor wettability—through Co/Nb interfacial engineering via mechanical alloying–hot rolling consolidation. Key results demonstrate that: (i) Co suppresses Fe2B by forming a lattice-matched (Co, Ti) B transition layer and enhances wettability via γ-Fe solid solution, achieving an effective interfacial transition zone > 10 μm; (ii) Nb preferentially forms NbB2 to block boron diffusion, but excess addition (> 40 wt%) induces brittle phases and microcracks; (iii) thermodynamic analysis confirms phase stability of Nb across 0–1600 °C, while Co demonstrates optimal performance in 400–1000 °C processing. Critically, TiB2-reinforced steel matrix composites co-doped with Co/Nb, featuring mechanically alloyed Core-Rim structures (TiB2-core/Co-shell spheres and TiB2-core/Nb-shell platelets), exhibit breakthrough properties via interfacial enhancement. Interfacial regions achieve 1086 MPa tensile strength (109% over matrix) and 835.6 HV hardness, establishing a critical foundation for high-strength laminated composites.