材料科学
硼化物
放电等离子烧结
陶瓷
微观结构
断裂韧性
复合材料
维氏硬度试验
博罗
冶金
硼
有机化学
化学
作者
Yan Zhang,Ze-Bin Jiang,Shi‐Kuan Sun,Wei‐Ming Guo,Qiusheng Chen,Jun-Xi Qiu,Kevin P. Plucknett,Hua‐Tay Lin
标识
DOI:10.1016/j.jeurceramsoc.2019.05.017
摘要
Starting from metal oxides, B4C and graphite, a suite of high-entropy boride ceramics, formulated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B2, (Hf0.2Zr0.2Mo0.2Nb0.2Ti0.2)B2 and (Hf0.2Mo0.2Ta0.2Nb0.2Ti0.2)B2 derived from boro/carbothermal reduction at 1600 °C were fabricated by spark plasma sintering at 2000 °C. It was found that the synthetic high-entropy boride crystalized in hexagonal structure and the yield of the targeting phase was calculated to be over 93.0 wt% in the sintered ceramics. Benefitting from the nearly full densification (96.3% ˜ 98.5% in relative density) and the refined microstructure, the products exhibited the relatively high Vickers hardness. The indentation fracture toughness was determined to be comparable with the single transition metal-diboride ceramics. It should be noted that the formation of high-entropy boride ceramics were featured with the relatively high hardness at no expense of the fracture toughness.
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