Nanotwins soften boron-rich boron carbide (B13C2)

Qi An; William A. Goddard

doi:10.1063/1.4978644

Nanotwins soften boron-rich boron carbide (B₁₃C₂)

Qi An
, William A. Goddard

Materials and Process Simulation Center
California Institute of Technology
University of Nevada-Reno
Nevada Institute for Sustainability
University of Nevada, Reno

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

Extensive studies of metals and alloys have observed that nanotwins lead to strengthening, but the role of nanotwins in ceramics is not well established. We compare here the shear strength and the deformation mechanism of nanotwinned boron-rich boron carbide (B₁₃C₂) with the perfect crystal under both pure shear and biaxial shear deformations. We find that the intrinsic shear strength of crystalline B₁₃C₂ is higher than that of crystalline boron carbide (B₄C). But nanotwins in B₁₃C₂ lower the strength, making it softer than crystalline B₄C. This reduction in strength of nanotwinned B₁₃C₂ arises from the interaction of the twin boundary with the C-B-C chains that connect the B₁₂ icosahedra.

Original language	English
Article number	111902
Journal	Applied Physics Letters
Volume	110
Issue number	11
DOIs	https://doi.org/10.1063/1.4978644
Publication status	Published - 13 Mar 2017
Externally published	Yes

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abstract = "Extensive studies of metals and alloys have observed that nanotwins lead to strengthening, but the role of nanotwins in ceramics is not well established. We compare here the shear strength and the deformation mechanism of nanotwinned boron-rich boron carbide (B13C2) with the perfect crystal under both pure shear and biaxial shear deformations. We find that the intrinsic shear strength of crystalline B13C2 is higher than that of crystalline boron carbide (B4C). But nanotwins in B13C2 lower the strength, making it softer than crystalline B4C. This reduction in strength of nanotwinned B13C2 arises from the interaction of the twin boundary with the C-B-C chains that connect the B12 icosahedra.",

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N2 - Extensive studies of metals and alloys have observed that nanotwins lead to strengthening, but the role of nanotwins in ceramics is not well established. We compare here the shear strength and the deformation mechanism of nanotwinned boron-rich boron carbide (B13C2) with the perfect crystal under both pure shear and biaxial shear deformations. We find that the intrinsic shear strength of crystalline B13C2 is higher than that of crystalline boron carbide (B4C). But nanotwins in B13C2 lower the strength, making it softer than crystalline B4C. This reduction in strength of nanotwinned B13C2 arises from the interaction of the twin boundary with the C-B-C chains that connect the B12 icosahedra.

AB - Extensive studies of metals and alloys have observed that nanotwins lead to strengthening, but the role of nanotwins in ceramics is not well established. We compare here the shear strength and the deformation mechanism of nanotwinned boron-rich boron carbide (B13C2) with the perfect crystal under both pure shear and biaxial shear deformations. We find that the intrinsic shear strength of crystalline B13C2 is higher than that of crystalline boron carbide (B4C). But nanotwins in B13C2 lower the strength, making it softer than crystalline B4C. This reduction in strength of nanotwinned B13C2 arises from the interaction of the twin boundary with the C-B-C chains that connect the B12 icosahedra.

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Nanotwins soften boron-rich boron carbide (B13C2)

Abstract

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Nanotwins soften boron-rich boron carbide (B₁₃C₂)