Microstructure and mechanical properties of high-entropy borides derived from boro/carbothermal reduction

By Yan Zhang, Zehua Jiang, Shikuan Sun, Wei‐Ming Guo, Qiufeng Chen, J. Qiu, K. Plucknett, Hua-Tay Lin. Journal of the European Ceramic Society, 2019

190 citations recorded by the source corpus.

Abstract 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.

Subfields: Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/205a45d3770ba1f5ae524802c49c35cf356f4cfb

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Citations in the corpus

• Dual-phase high-entropy ultra-high temperature ceramics (2020, methodology): “96 N [62] 92.”
• High-Entropy Ceramics (2019, methodology): “[4] used the combination of B4C, graphite, and metal oxides to synthesize (Hf0.”