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<p>Due to titanium’s high reactivity, the formation of brittle Fe-Ti intermetallic compounds at the composite interface can significantly weaken the shear strength of titanium/steel composite materials. Therefore, the rolling temperature must be limited below 850&#xa0;°C to avoid excessive reaction and the formation of brittle phases, which has become a common challenge in preparation. This study addresses the issue of brittle Fe-Ti compound formation at the interface during titanium/steel composite material preparation. It proposes a new approach based on synergistic control of microstructure and diffusion coefficient to induce a barrier effect of TiC at the interface. The interfacial structure evolution and electronic properties were systematically investigated in the temperature range of 850–1000&#xa0;°C. Results show that after microstructure regulation, the near-interface structure on the Ti side transforms from β-Ti to α-Ti. The α-Fe(100)/α-Ti(0001) interface exhibits strong covalent bond characteristics, with interfacial adhesion work increased by 47.6% compared to the α-Fe(100)/β-Ti(001) interface. A uniform TiC layer with a thickness of approximately 200&#xa0;nm is formed at the interface through synergistic control of grain orientation and diffusion behavior. After microstructure regulation, a (010) oriented layer forms on the Ti side near the interface, while a (101) oriented layer appears on the Fe side. The proportion of low-angle grain boundaries increases from 7.84 to 50.6%, and the proportion of Σ3 grain boundaries on the steel side rises from 4.78 to 16.7%. The synergistic effect of special grain boundary induction and grain orientation control further enhances the uniform distribution of TiC, significantly increasing the interface shear strength from 210 to 340&#xa0;MPa. This achieves a breakthrough in the industrial application of high-temperature composite rolling at 1000&#xa0;°C, providing a new technological approach and theoretical foundation for preparing high-performance titanium/steel composite materials.</p>

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Effect of titanium/steel composite interfacial structural modification on intermetallic compounds growth behavior and mechanical properties

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Xiaoling Lei,
  • Wenhong Ding,
  • Zhuang Chen,
  • Lu Guo,
  • Chenxu Wang,
  • Yongzhi Fu,
  • Keke Deng

摘要

Due to titanium’s high reactivity, the formation of brittle Fe-Ti intermetallic compounds at the composite interface can significantly weaken the shear strength of titanium/steel composite materials. Therefore, the rolling temperature must be limited below 850 °C to avoid excessive reaction and the formation of brittle phases, which has become a common challenge in preparation. This study addresses the issue of brittle Fe-Ti compound formation at the interface during titanium/steel composite material preparation. It proposes a new approach based on synergistic control of microstructure and diffusion coefficient to induce a barrier effect of TiC at the interface. The interfacial structure evolution and electronic properties were systematically investigated in the temperature range of 850–1000 °C. Results show that after microstructure regulation, the near-interface structure on the Ti side transforms from β-Ti to α-Ti. The α-Fe(100)/α-Ti(0001) interface exhibits strong covalent bond characteristics, with interfacial adhesion work increased by 47.6% compared to the α-Fe(100)/β-Ti(001) interface. A uniform TiC layer with a thickness of approximately 200 nm is formed at the interface through synergistic control of grain orientation and diffusion behavior. After microstructure regulation, a (010) oriented layer forms on the Ti side near the interface, while a (101) oriented layer appears on the Fe side. The proportion of low-angle grain boundaries increases from 7.84 to 50.6%, and the proportion of Σ3 grain boundaries on the steel side rises from 4.78 to 16.7%. The synergistic effect of special grain boundary induction and grain orientation control further enhances the uniform distribution of TiC, significantly increasing the interface shear strength from 210 to 340 MPa. This achieves a breakthrough in the industrial application of high-temperature composite rolling at 1000 °C, providing a new technological approach and theoretical foundation for preparing high-performance titanium/steel composite materials.