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<p>Hf<sub><i>x</i></sub>Ta<sub>1−<i>x</i></sub>C-based ceramics exhibit exceptional thermodynamic stability under extreme temperatures. However, their intrinsic brittleness raises significant concerns about their safe service in extreme environments. Here, we designed and fabricated HfTaC<sub>2</sub>/W dual-phase ceramics with robust interface bonding through induction plasma spheroidization. During <i>in situ</i> transmission electron microscopy (TEM) mechanical testing, the dual-phase ceramics exhibited plastic deformation with a fracture strength of (7.6 ± 1.2) GPa and a strain of 23.8% ± 0.18% in nanopillar compression, and a fracture strain of 6.2% under tensile loading. The mechanism of plastic deformation in both compression and tensile tests is attributed to the interactions between dislocations and dual-phase interfaces, as well as the dislocation movement inside the W phase. Thus, our work demonstrates the enhanced plasticity of dual-phase HfTaC<sub>2</sub>/W with a W network embedded in the HfTaC<sub>2</sub> matrix than singlephase HfTaC<sub>2</sub>, and provides a paradigm for the development of advanced ceramics that combine strength with enhanced ductility for both functional and structural applications.</p>

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Unveiling the microscopic origins of dual-phase HfTaC2/W ceramics with enhanced plasticity

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Changxing Zhang,
  • Ke Cao,
  • Junhui Luo,
  • Xiaofei Zhu,
  • Junkai Liu,
  • Ying Han,
  • Ran He,
  • Qian Li,
  • Li Yang,
  • Yichun Zhou

摘要

HfxTa1−xC-based ceramics exhibit exceptional thermodynamic stability under extreme temperatures. However, their intrinsic brittleness raises significant concerns about their safe service in extreme environments. Here, we designed and fabricated HfTaC2/W dual-phase ceramics with robust interface bonding through induction plasma spheroidization. During in situ transmission electron microscopy (TEM) mechanical testing, the dual-phase ceramics exhibited plastic deformation with a fracture strength of (7.6 ± 1.2) GPa and a strain of 23.8% ± 0.18% in nanopillar compression, and a fracture strain of 6.2% under tensile loading. The mechanism of plastic deformation in both compression and tensile tests is attributed to the interactions between dislocations and dual-phase interfaces, as well as the dislocation movement inside the W phase. Thus, our work demonstrates the enhanced plasticity of dual-phase HfTaC2/W with a W network embedded in the HfTaC2 matrix than singlephase HfTaC2, and provides a paradigm for the development of advanced ceramics that combine strength with enhanced ductility for both functional and structural applications.