Structure and mechanical properties of boron-rich boron carbides

Chun Cheng, Kolan M. Reddy, Akihiko Hirata, Takeshi Fujita, Mingwei Chen

研究成果: Article査読

50 被引用数 (Scopus)


A series of boron-rich boron carbides are investigated to explore the effect of boron/carbon ratios on the microstructure and mechanical properties of the complex material. It has been found that excess boron substitution gives rise to expanded lattice constants, orientational asymmetry of the chain structure and distortion of the icosahedra of rhombohedra B4C units in comparison with conventional carbon-rich boron carbides. Microstructure characterization reveals a high density of stacking faults and growth twins in boron-rich boron carbides. Nanoindentation measurements demonstrate that the hardness and modulus of boron-rich boron carbides decrease with the increase of boron content while the B10.2C sample with the highest boron substitution shows relatively high hardness and modulus. This study suggests that the structure of single-phase covalent materials could be tailored by self-alloying for improved mechanical properties.

ジャーナルJournal of the European Ceramic Society
出版ステータスPublished - 2017 12

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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