金属缺陷AlB PDMATHAAB型（Ti $_{0.2}$ Zr $_{0.2}$ Hf $_{0.2}$ Nb $_{0.2}$ Ta $_{0.2}$）$_{1-δ}$ B $_{2}$高熵二硼化物，具有高硬度
Metal deficient AlB$_{2}$-type (Ti$_{0.2}$Zr$_{0.2}$Hf$_{0.2}$Nb$_{0.2}$Ta$_{0.2}$)$_{1-δ}$B$_{2}$ high-entropy diborides with high hardness
摘要：
本文报道了缺金属（Ti $_{0.2}$ Zr $_{0.2}$ Hf $_{0.2}$ Nb $_{0.2}$ Ta $_{0.2}$）$_{1-δ}$ B $_{2}$高熵二硼化物（HEBs）的合成与表征。在$δ$为0.03 $\leq$ $δ$ $\leq$ 0.18的范围内成功地获得单一均匀的AlB $_{2}$型相。随着$δ$的增加，晶胞体积呈现出非单调变化，在$δ$ = 0.07处具有最大值。在9.8 N的载荷下，这些贫金属HEB具有16.6-18.9 GPa的高维氏硬度，其相稳定性归因于混合熵的增加。我们的研究结果不仅提出了第一系列的缺金属AlB $_{2}$型HEBs，但也建议存在类似的多组分二硼化物。
英文摘要：
We report the synthesis and characterization of metal deficient (Ti$_{0.2}$Zr$_{0.2}$Hf$_{0.2}$Nb$_{0.2}$Ta$_{0.2}$)$_{1-δ}$B$_{2}$ high-entropy diborides (HEBs). A single homogeneous AlB$_{2}$-type phase is successfully obtained over the $δ$ range of 0.03 $\leq$ $δ$ $\leq$ 0.18. With increasing $δ$, the unit-cell volume exhibits a nonmonotonic variation with a maximum at $δ$ = 0.07. These metal-deficient HEBs possess high Vickers hardness of 16.6-18.9 GPa at a load of 9.8 N and their phase stability is attributed to the increased mixing entropy. Our results not only present the first series of metal-deficient AlB$_{2}$-type HEBs, but also suggest the existence of similar multicomponent diborides.
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