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High-Entropy Monoborides: Towards Superhard Materials

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arxiv 2007.15454 v2 pith:5M54RPSQ submitted 2020-07-26 cond-mat.mtrl-sci

Mingde Qin , Qizhang Yan , Haoren Wang , Kenneth S. Vecchio , Jian Luo This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords high-entropysuperhardhardnessmonoboridesalreadyballbeenboride
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Single-phase high-entropy monoborides (HEMBs) of the CrB prototype structure have been synthesized for the first time. Reactive spark plasma sintering of ball milled mixtures of elemental precursor powders produced bulk (V0.2Cr0.2Nb0.2Mo0.2Ta0.2)B, (V0.2Cr0.2Nb0.2Mo0.2W0.2)B, and (V0.2Cr0.2Nb0.2Ta0.2W0.2)B HEMB specimens of ~98.3-99.5% relative densities. Vickers hardness was measured to be ~22-26 GPa at an indentation load of 9.8 N and ~32-37 GPa at 0.98 N. In particular, the load-dependent hardness of (V0.2Cr0.2Nb0.2Ta0.2W0.2)B is higher than those of ternary (Ta0.5W0.5)B (already considered as superhard) and hardest reported high-entropy metal diborides, and on a par with the classical superhard boride WB4.

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