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<p>To address key challenges at metal-ceramic/steel heterogeneous interfaces, specifically microcracking from thermal expansion mismatch, weak interfacial bonding, and brittle phase formation, this study introduces an innovative hybrid process combining mechanical alloying with multi-pass hot rolling. This study systematically examines how Ni additions influence interfacial evolution and mechanical properties in TiB<sub>2</sub>-reinforced high-strength steel. Integrated thermodynamic modeling, XRD phase analysis, and SEM–EDS characterization reveal Ni′s pivotal role in redirecting interfacial reaction pathways. While the TiB<sub>2</sub>–Fe system generates brittle Fe<sub>2</sub>B phases during processing, the TiB<sub>2</sub>–Ni system promotes Ni₃B intermetallic formation, effectively suppressing detrimental brittle compounds. With 66 wt.% Ni content, the interface develops a continuous gradient transition layer measuring 8–15&#xa0;μm in thickness, demonstrating significantly enhanced elemental interdiffusion and structural continuity compared to the 50 wt.% Ni system. Microhardness profiles further verify superior interfacial hardness distribution and bonding integrity in the TiB<sub>2</sub>–66&#xa0;wt.% Ni composite. By establishing correlations between phase evolution and interfacial microstructure, this work elucidates the fundamental mechanism through which Ni content enhances interfacial strength and toughness, providing innovative design principles and processing strategies to overcome bonding challenges in ceramic-metal systems.</p>

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Effect of Ni addition on heterogeneous interface fusion of TiB2-based cermet and advanced high-strength steels

  • 期刊论文

  • 发表日期：

    2025年12月22日

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

摘要

To address key challenges at metal-ceramic/steel heterogeneous interfaces, specifically microcracking from thermal expansion mismatch, weak interfacial bonding, and brittle phase formation, this study introduces an innovative hybrid process combining mechanical alloying with multi-pass hot rolling. This study systematically examines how Ni additions influence interfacial evolution and mechanical properties in TiB2-reinforced high-strength steel. Integrated thermodynamic modeling, XRD phase analysis, and SEM–EDS characterization reveal Ni′s pivotal role in redirecting interfacial reaction pathways. While the TiB2–Fe system generates brittle Fe2B phases during processing, the TiB2–Ni system promotes Ni₃B intermetallic formation, effectively suppressing detrimental brittle compounds. With 66 wt.% Ni content, the interface develops a continuous gradient transition layer measuring 8–15 μm in thickness, demonstrating significantly enhanced elemental interdiffusion and structural continuity compared to the 50 wt.% Ni system. Microhardness profiles further verify superior interfacial hardness distribution and bonding integrity in the TiB2–66 wt.% Ni composite. By establishing correlations between phase evolution and interfacial microstructure, this work elucidates the fundamental mechanism through which Ni content enhances interfacial strength and toughness, providing innovative design principles and processing strategies to overcome bonding challenges in ceramic-metal systems.