Medium‐entropy (Ti,Zr,Hf)C ceramics were prepared by hot pressing a dual‐phase medium‐entropy carbide powder with low oxygen content (0.45 wt%). The results demonstrate that the medium‐entropy (Ti,Zr,Hf)C ceramics sintered at 2100°C had a relative density of 99.2% and an average grain size of 1.9 ± 0.6 μm. The flexural strength of (Ti,Zr,Hf)C carbide ceramics at room temperature was 579 ± 62 MPa. With an increase in temperature to 1600°C, the flexural strength showed an increase up to 619 ± 57 MPa, and had no significant degradation even up to 1800°C. The high‐temperature flexural strengths of (Ti,Zr,Hf)C were obviously higher than those of the monocarbide ceramics (TiC, ZrC, and HfC). The primary strengthening mechanism in (Ti,Zr,Hf)C could be attributed to the high lattice parameter mismatch effects between TiC and ZrC, which not only inhibited the fast grain coarsening of (Ti,Zr,Hf)C ceramics, but also increased the grain‐boundary strength of the obtained ceramics.

中文翻译：

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高达1800°C的高强度中熵（Ti，Zr，Hf）C陶瓷

中熵（Ti，Zr，Hf）C陶瓷是通过热压低氧含量（0.45 wt％）的双相中熵碳化物粉末制备的。结果表明，在2100°C烧结的中熵（Ti，Zr，Hf）C陶瓷的相对密度为99.2％，平均晶粒尺寸为1.9±0.6μm。（Ti，Zr，Hf）C碳化物陶瓷在室温下的抗弯强度为579±62 MPa。随着温度升高到1600°C，弯曲强度显示出增加到619±57 MPa，甚至在1800°C时也没有明显的降解。（Ti，Zr，Hf）C的高温抗弯强度明显高于单碳化物陶瓷（TiC，ZrC和HfC）。（Ti，Zr，Hf）C的主要强化机制可能归因于TiC和ZrC之间的高晶格参数失配效应，