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<p>Novel Ti(C,N)-based cermets with TiC, TiN<sub>0.3</sub>, CoCrNiCuFe<sub>0.5</sub>Mn, AlN and WC addition were successfully fabricated by mechanical alloying and spark plasma sintering&#xa0;(SPS). The effect of AlN addition on phase composition and mechanical properties of the as-prepared Ti(C,N)-based cermets was investigated by using x-ray diffraction, field scanning electron microscopy, Vickers hardness tester and three-point bending test. The results showed that the decomposition of AlN in the solid phase sintering stage had a remarkable effect on the phase transition and mechanical properties of the ceramics. The Al atom induces the transition of the binder phase from BCC to a more stable FCC phase, and the N atom acted as the N source generated by the ceramic phase. The increase of FCC phase content with the increase of AlN enhances the wettability of the high-entropy alloy binder to the ceramic phase and inhibits grain growth, resulting in the reduction of grain boundary pores and the improvement of mechanical properties. The relative density, hardness and fracture toughness were 98.16%, 20.56&#xa0;Gpa and 8.0&#xa0;MPa.m<sup>1/2</sup>, respectively.</p>

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Improvement in Properties of Novel In-Situ Ti(C,N)-Based Cermets with AlN Addition

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Qin Zou,
  • Haibo Ren,
  • Yanguo Li,
  • Zhichao Lou,
  • Yongan Luo

摘要

Novel Ti(C,N)-based cermets with TiC, TiN0.3, CoCrNiCuFe0.5Mn, AlN and WC addition were successfully fabricated by mechanical alloying and spark plasma sintering (SPS). The effect of AlN addition on phase composition and mechanical properties of the as-prepared Ti(C,N)-based cermets was investigated by using x-ray diffraction, field scanning electron microscopy, Vickers hardness tester and three-point bending test. The results showed that the decomposition of AlN in the solid phase sintering stage had a remarkable effect on the phase transition and mechanical properties of the ceramics. The Al atom induces the transition of the binder phase from BCC to a more stable FCC phase, and the N atom acted as the N source generated by the ceramic phase. The increase of FCC phase content with the increase of AlN enhances the wettability of the high-entropy alloy binder to the ceramic phase and inhibits grain growth, resulting in the reduction of grain boundary pores and the improvement of mechanical properties. The relative density, hardness and fracture toughness were 98.16%, 20.56 Gpa and 8.0 MPa.m1/2, respectively.