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Compressibility and strength of nanocrystalline tungsten boride under compression to 60 GPa

Author(s): Dong, Haini; Dorfman, Susannah M; Chen, Y; Wang, H; Wang, J; et al

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Abstract: The compression behavior and stress state of nanocrystalline tungsten boride (WB) were investigated using radial x-ray diffraction (RXRD) in a diamond-anvil cell under non-hydrostatic compression up to 60.4 GPa. The compression properties and stress state are analyzed using lattice strain theory. Experiments were conducted at beamline X17C of the National Synchrotron Light Source. The radial x-ray diffraction data yield a bulk modulus that is qualitatively consistent with density functional theory calculations and demonstrate that WB is a highly incompressible material. A maximum differential stress, t, of about 14 GPa can be supported by nanocrystalline WB at the highest pressure. This corresponds to about 5% of the shear modulus, G, which is smaller than the values of t/G (∼8%-10%) observed for BC 2N, B 6O, TiB 2, and γ-Si 3N 4 at high pressures. Thus, while WB is highly incompressible, its strength is relatively low at high pressures compared to other hard ceramics.
Publication Date: 2012
Electronic Publication Date: 21-Jun-2012
Citation: Dong, H, Dorfman, SM, Chen, Y, Wang, H, Wang, J, Qin, J, He, D, Duffy, TS. (2012). Compressibility and strength of nanocrystalline tungsten boride under compression to 60 GPa. Journal of Applied Physics, 111 (10.1063/1.4728208)
DOI: doi:10.1063/1.4728208
ISSN: 0021-8979
Pages: 123514-1 - 123514-5
Language: English
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Applied Physics
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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