Abstract A high-entropy M2AlC-MC (M=Ti, Zr, Hf, Nb, Ta) composite was produced by reactive hot pressing using Ti, Zr, Hf, Nb, Ta, Al, and graphite as raw materials. Successful solution of the five transition metals in both hexagonal M2AlC and cubic MC was confirmed by XRD, SEM, atom-resolved STEM and EDS elemental analyses. The high-entropy M2AlC shows larger delocalization of atoms and higher lattice strain than the high-entropy MC along with considerable amount of Al vacancies. The formation mechanism of the high-entropy composite has been discussed. The Vickers hardness of the composite is measured to be 11.1 ± 1.1 GPa.

中文翻译：

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高熵 M2AlC-MC（M=Ti、Zr、Hf、Nb、Ta）复合材料：合成和微观结构

摘要 以Ti、Zr、Hf、Nb、Ta、Al和石墨为原料，通过反应热压制备了高熵M2AlC-MC（M=Ti、Zr、Hf、Nb、Ta）复合材料。XRD、SEM、原子分辨 STEM 和 EDS 元素分析证实了五种过渡金属在六方 M2AlC 和立方 MC 中的成功溶解。与高熵 MC 相比，高熵 M2AlC 显示出更大的原子离域和更高的晶格应变以及大量的铝空位。讨论了高熵复合材料的形成机制。复合材料的维氏硬度经测量为 11.1 ± 1.1 GPa。