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<p>The non-equimolar Ti-Zr-Nb-V-Cr high-entropy carbide ceramics were first screened using first-principles calculations and subsequently synthesized successfully under a pressure of 30&#xa0;MPa via spark plasma sintering (SPS). The chemical composition, phase evolution, phase formation mechanisms, mechanical properties, and strengthening mechanisms were systematically investigated. The results indicate that the presence of TiC and ZrC contributes to enhanced hardness, which increases as the NbC content decreases. The matrix compositions exhibit a transition from single-phase to multi-phase structures, where the single-phase carbides do not demonstrate optimal mechanical properties. In contrast, the non-equimolar multi-phase carbides achieve remarkable mechanical performance, including a hardness of 24.78 GPa, a fracture toughness of 5.37 MPa·m<sup>1/2</sup>, and a flexural strength of 480.78&#xa0;MPa.</p>

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Preparation of high strength and toughness (Ti-Zr-Nb-V-Cr)C high-entropy ceramics through non-stoichiometric elemental ratios

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Dong Wang,
  • ZhengWei Ding,
  • Yulin Zhang,
  • Bo Zhao,
  • Gang Qi

摘要

The non-equimolar Ti-Zr-Nb-V-Cr high-entropy carbide ceramics were first screened using first-principles calculations and subsequently synthesized successfully under a pressure of 30 MPa via spark plasma sintering (SPS). The chemical composition, phase evolution, phase formation mechanisms, mechanical properties, and strengthening mechanisms were systematically investigated. The results indicate that the presence of TiC and ZrC contributes to enhanced hardness, which increases as the NbC content decreases. The matrix compositions exhibit a transition from single-phase to multi-phase structures, where the single-phase carbides do not demonstrate optimal mechanical properties. In contrast, the non-equimolar multi-phase carbides achieve remarkable mechanical performance, including a hardness of 24.78 GPa, a fracture toughness of 5.37 MPa·m1/2, and a flexural strength of 480.78 MPa.