Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases

K. Madhav Reddy, J. J. Guo, Y. Shinoda, T. Fujita, Akihiko Hirata, J. P. Singh, J. W. McCauley, M. W. Chen

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Ceramics typically have very high hardness, but low toughness and plasticity. Besides intrinsic brittleness associated with rigid covalent or ionic bonds, porosity and interface phases are the foremost characteristics that lead to their failure at low stress levels in a brittle manner. Here we show that, in contrast to the conventional wisdom that these features are adverse factors in mechanical properties of ceramics, the compression strength, plasticity and toughness of nanocrystalline boron carbide can be noticeably improved by introducing nanoporosity and weak amorphous carbon at grain boundaries. Transmission electron microscopy reveals that the unusual nanosize effect arises from the deformation-induced elimination of nanoporosity mediated by grain boundary sliding with the assistance of the soft grain boundary phases. This study has important implications in developing high-performance ceramics with ultrahigh strength and enhanced plasticity and toughness.

Original languageEnglish
Article number1052
JournalNature Communications
Volume3
DOIs
Publication statusPublished - 2012 Oct 8
Externally publishedYes

Fingerprint

Phase interfaces
Boron carbide
boron carbides
Boron
Ceramics
toughness
plastic properties
Toughness
Plasticity
grain boundaries
mechanical properties
ceramics
Mechanical properties
Grain boundaries
brittleness
Grain boundary sliding
Porosity
Amorphous carbon
Hardness
covalent bonds

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases. / Madhav Reddy, K.; Guo, J. J.; Shinoda, Y.; Fujita, T.; Hirata, Akihiko; Singh, J. P.; McCauley, J. W.; Chen, M. W.

In: Nature Communications, Vol. 3, 1052, 08.10.2012.

Research output: Contribution to journalArticle

Madhav Reddy, K. ; Guo, J. J. ; Shinoda, Y. ; Fujita, T. ; Hirata, Akihiko ; Singh, J. P. ; McCauley, J. W. ; Chen, M. W. / Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases. In: Nature Communications. 2012 ; Vol. 3.
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