Atomic structure of amorphous shear bands in boron carbide

K. Madhav Reddy, P. Liu, Akihiko Hirata, T. Fujita, M. W. Chen

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Amorphous shear bands are the main deformation and failure mode of super-hard boron carbide subjected to shock loading and high pressures at room temperature. Nevertheless, the formation mechanisms of the amorphous shear bands remain a long-standing scientific curiosity mainly because of the lack of experimental structure information of the disordered shear bands, comprising light elements of carbon and boron only. Here we report the atomic structure of the amorphous shear bands in boron carbide characterized by state-of-the-art aberration-corrected transmission electron microscopy. Distorted icosahedra, displaced from the crystalline matrix, were observed in nano-sized amorphous bands that produce dislocation-like local shear strains. These experimental results provide direct experimental evidence that the formation of amorphous shear bands in boron carbide results from the disassembly of the icosahedra, driven by shear stresses.

Original languageEnglish
Article number2483
JournalNature Communications
Volume4
DOIs
Publication statusPublished - 2013 Oct 1
Externally publishedYes

Fingerprint

Boron carbide
boron carbides
Boron
Shear bands
atomic structure
shear
Exploratory Behavior
Transmission Electron Microscopy
Shear strain
Shock
Aberrations
Carbon
shear strain
light elements
failure modes
Failure modes
Shear stress
Light
Pressure
shear stress

ASJC Scopus subject areas

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

Cite this

Atomic structure of amorphous shear bands in boron carbide. / Reddy, K. Madhav; Liu, P.; Hirata, Akihiko; Fujita, T.; Chen, M. W.

In: Nature Communications, Vol. 4, 2483, 01.10.2013.

Research output: Contribution to journalArticle

Reddy, K. Madhav ; Liu, P. ; Hirata, Akihiko ; Fujita, T. ; Chen, M. W. / Atomic structure of amorphous shear bands in boron carbide. In: Nature Communications. 2013 ; Vol. 4.
@article{8aec1357b7524acc80e7892da77d9f13,
title = "Atomic structure of amorphous shear bands in boron carbide",
abstract = "Amorphous shear bands are the main deformation and failure mode of super-hard boron carbide subjected to shock loading and high pressures at room temperature. Nevertheless, the formation mechanisms of the amorphous shear bands remain a long-standing scientific curiosity mainly because of the lack of experimental structure information of the disordered shear bands, comprising light elements of carbon and boron only. Here we report the atomic structure of the amorphous shear bands in boron carbide characterized by state-of-the-art aberration-corrected transmission electron microscopy. Distorted icosahedra, displaced from the crystalline matrix, were observed in nano-sized amorphous bands that produce dislocation-like local shear strains. These experimental results provide direct experimental evidence that the formation of amorphous shear bands in boron carbide results from the disassembly of the icosahedra, driven by shear stresses.",
author = "Reddy, {K. Madhav} and P. Liu and Akihiko Hirata and T. Fujita and Chen, {M. W.}",
year = "2013",
month = "10",
day = "1",
doi = "10.1038/ncomms3483",
language = "English",
volume = "4",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Atomic structure of amorphous shear bands in boron carbide

AU - Reddy, K. Madhav

AU - Liu, P.

AU - Hirata, Akihiko

AU - Fujita, T.

AU - Chen, M. W.

PY - 2013/10/1

Y1 - 2013/10/1

N2 - Amorphous shear bands are the main deformation and failure mode of super-hard boron carbide subjected to shock loading and high pressures at room temperature. Nevertheless, the formation mechanisms of the amorphous shear bands remain a long-standing scientific curiosity mainly because of the lack of experimental structure information of the disordered shear bands, comprising light elements of carbon and boron only. Here we report the atomic structure of the amorphous shear bands in boron carbide characterized by state-of-the-art aberration-corrected transmission electron microscopy. Distorted icosahedra, displaced from the crystalline matrix, were observed in nano-sized amorphous bands that produce dislocation-like local shear strains. These experimental results provide direct experimental evidence that the formation of amorphous shear bands in boron carbide results from the disassembly of the icosahedra, driven by shear stresses.

AB - Amorphous shear bands are the main deformation and failure mode of super-hard boron carbide subjected to shock loading and high pressures at room temperature. Nevertheless, the formation mechanisms of the amorphous shear bands remain a long-standing scientific curiosity mainly because of the lack of experimental structure information of the disordered shear bands, comprising light elements of carbon and boron only. Here we report the atomic structure of the amorphous shear bands in boron carbide characterized by state-of-the-art aberration-corrected transmission electron microscopy. Distorted icosahedra, displaced from the crystalline matrix, were observed in nano-sized amorphous bands that produce dislocation-like local shear strains. These experimental results provide direct experimental evidence that the formation of amorphous shear bands in boron carbide results from the disassembly of the icosahedra, driven by shear stresses.

UR - http://www.scopus.com/inward/record.url?scp=84884655181&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884655181&partnerID=8YFLogxK

U2 - 10.1038/ncomms3483

DO - 10.1038/ncomms3483

M3 - Article

VL - 4

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 2483

ER -