Boron carbide under torsional deformation: Evidence of the formation of chain vacancies in the plastic regime

Chakraborti, Amrita; Jay, Antoine; Duparc, Olivier Hardouin; Sjakste, Jelena; Béneut, Keevin; Vast, Nathalie; Godec, Yann Le

doi:10.1016/j.actamat.2021.117553

Cited by 7 publications

(2 citation statements)

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“…Furthermore, extensive theoretical and experimental investigations indicated that the icosahedron preferentially contained a carbon atom (i.e., as B 11 C) for boron carbide with a carbon content of ≈20%. [ 28–32 ] Based on the STEM observation and composition analysis, as well as previous studies, [ 28,33–39 ] the chemical formula of this boron carbide was determined as B 11 C 3 , consisting of B 11 C icosahedra and boron deficient C–▫–C chains (Figure 1f).…”

Section: Resultsmentioning

confidence: 77%

In Situ Observation of Fracture along Twin Boundaries in Boron Carbide

Wang

et al. 2022

Advanced Materials

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The observation of fracture behaviors in perfect and twinned B4C crystals via in situ transmission electron microscopy (TEM) mechanical testing is reported. The crystal structure of the synthesized B4C, composed of B11C icosahedra connected by boron‐deficient C–▫–C chains in a chemical formula of B11C3, is determined by state‐of‐the‐art aberration‐corrected scanning TEM. The in situ TEM observations reveal that cracking is preferentially initiated at the twin boundaries (TBs) in B4C under both indentation and tension loading. The cracks then propagate along the TBs, thus resulting in the fracture of B4C. These results are consistent with the theoretical calculations that show that TBs have a softening effect on B4C with amorphous bands preferentially nucleated at the TBs. These findings elucidate the atomic arrangement and the role of planar defects in the failure of B4C. Furthermore, they can guide the design of advanced superhard materials via planar defect control.

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Section: Resultsmentioning

confidence: 77%

In Situ Observation of Fracture along Twin Boundaries in Boron Carbide

Wang

et al. 2022

Advanced Materials

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“…Another is the rotating tomography Paris-Edinburgh cell (RoToPEc) (Philippe et al, 2016), which has been in use at the PSICHE beamline (e.g. King et al, 2016King et al, , 2019 at Synchrotron SOLEIL (Saint-Aubin, France), on the ID27 beamline at the ESRF (Grenoble, France) (A ´lvarez-Murga et al, 2017;Chakraborti et al, 2022) and I11 beamline at Diamond Light Source synchrotron (Oxfordshire, UK) (e.g. Philippe et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Deformation of two-phase aggregates with in situ X-ray tomography in rotating Paris–Edinburgh cell at GPa pressures and high temperature

Mandolini

Chantel

Merkel

et al. 2023

J Synchrotron Radiat

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High-pressure (>1 GPa) torsion apparatus can be coupled with in situ X-ray tomography (XRT) to study microstructures in materials associated with large shear strains. Here, deformation experiments were carried out on multi-phase aggregates at ∼3–5 GPa and ∼300–500°C, using a rotational tomography Paris–Edinburgh press (RoToPEc) with in situ absorption contrast XRT on the PSICHE beamline at Synchrotron SOLEIL. The actual shear strain reached in the samples was quantified with respect to the anvil twisting angles, which is γ ≤ 1 at 90° anvil twist and reaches γ ≃ 5 at 225° anvil twist. 2D and 3D quantifications based on XRT that can be used to study in situ the deformation microfabrics of two-phase aggregates at high shear strain are explored. The current limitations for investigation in real time of deformation microstructures using coupled synchrotron XRT with the RoToPEc are outlined.

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