Shocked ceramics melt: An atomistic analysis of thermodynamic behavior of boron carbide

DeVries, Matthew; Subhash, Ghatu

doi:10.1103/physrevb.101.144107

Cited by 36 publications

(23 citation statements)

References 46 publications

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“…Their results indicated that boron carbide will partially or complete melt under such high pressure and cannot recrystallize after cooling. They also predicted the Hugoniot relationship from ReaxFF MD simulations [19], which agreed well with experimental measurements.…”

Section: Accepted Articlesupporting

confidence: 73%

“…16 The effects of temperature on the amorphization mechanism have also been considered using MD simulations, 18 and. 19 Once granular flow begins, we also observe dilation in the ceramic, and this results in the development of porosity. Subsequent loading by compression waves then result in the crushing of the porosity, and so pore compaction must also be incorporated as a potential mechanism.…”

Section: Mechanismsmentioning

confidence: 83%

“…[29][30][31] Unfortunately the standard techniques for A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Methodsmentioning

confidence: 99%

“…These include amorphization at high pressures [15], massive fracture [16] and fragmentation [17], and granular flow [16]. The effects of temperature on the amorphization mechanism have also been considered using MD simulations, [18] and [19]. Once granular flow begins, we also observe dilation in the ceramic, and this results in the development of porosity.…”

Section: Identification Of Key Mechanismsmentioning

confidence: 96%

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Models for the behavior of boron carbide in extreme dynamic environments

et al. 2021

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We describe models for the behavior of hot-pressed boron carbide that is subjected to extreme dynamic environments such as ballistic impact. We first identify the deformation and failure mechanisms that are observed in boron carbide under such conditions, and then review physics-based models for each of these mechanisms and the integration of these models into a single physics-based continuum model for the material. Atomistic modeling relates the composition and stoichiometry to the amorphization threshold, while mesoscale

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Section: Accepted Articlesupporting

confidence: 73%

Section: Mechanismsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Identification Of Key Mechanismsmentioning

confidence: 96%

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Models for the behavior of boron carbide in extreme dynamic environments

et al. 2021

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“…[32]). Thus, whenever, in a shock wave experiment, a dynamical stress of 17 GPa (the HEL of boron carbide) is applied and the elevation of temperature is up to 2000 K [33][34][35], the equivalent state of stress at ambient temperature amounts to (17-12.2) GPa = 4.8 GPa [32]. Therefore, a value of 5 GPa during the generation of the torsion at ambient temperature is expected to be a good approximation of the non-hydrostatic conditions as those near the HEL for boron carbide [36].…”

Section: B Materialsmentioning

confidence: 99%

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

Chakraborti¹,

Jay²,

Duparc³

et al. 2021

Preprint

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We report a combined experimental and theoretical study of boron carbide under stress/deformation. A special rotating anvil press, the rotating tomography Paris Edinburgh cell (RotoPEC), has been used to apply torsional deformation to boron carbide under a pressure of 5 GPa at ambient temperature. Subsequent damages and point defects have been analysed at ambient pressure by energy dispersive X-ray microdiffraction at the synchrotron and by Raman spectroscopy, combined with calculations based on the density functional theory (DFT). We show that apart from the signals due to B 4 C, new peaks appear in both characterisation methods. The DFT calculations of atomic structures and phonon frequencies enable us to attribute most of the new peaks to boron vacancies in the intericosahedral chains of boron carbide. Some of the Raman spectra also show three peaks that have been attributed to amorphous boron carbide in the literature. Deformed boron carbide thus shows small inclusions of clusters of boron carbide with chain vacancies, and/or small zones interpreted as amorphous zones.

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Shock Response of Brittle Solids

2021

Dynamic Response of Advanced Ceramics

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Shocked ceramics melt: An atomistic analysis of thermodynamic behavior of boron carbide

Cited by 36 publications

References 46 publications

Models for the behavior of boron carbide in extreme dynamic environments

Models for the behavior of boron carbide in extreme dynamic environments

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

Shock Response of Brittle Solids

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