Asymmetric twins in rhombohedral boron carbide

Takeshi Fujita, Pengfei Guan, K. Madhav Reddy, Akihiko Hirata, Junjie Guo, Mingwei Chen

研究成果: Article査読

26 被引用数 (Scopus)


Superhard materials consisting of light elements have recently received considerable attention because of their ultrahigh specific strength for a wide range of applications as structural and functional materials. However, the failure mechanisms of these materials subjected to high stresses and dynamic loading remain to be poorly known. We report asymmetric twins in a complex compound, boron carbide (B4C), characterized by spherical-aberration- corrected transmission electron microscopy. The atomic structure of boron-rich icosahedra at rhombohedral vertices and cross-linked carbon-rich atomic chains can be clearly visualized, which reveals unusual asymmetric twins with detectable strains along the twin interfaces. This study offers atomic insights into the structure of twins in a complex material and has important implications in understanding the planar defect-related failure of superhard materials under high stresses and shock loading.

ジャーナルApplied Physics Letters
出版ステータスPublished - 2014 1月 13

ASJC Scopus subject areas

  • 物理学および天文学(その他)


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