2006
DOI: 10.1103/physrevlett.97.035502
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Behavior of Disordered Boron Carbide under Stress

Abstract: Gibbs free-energy calculations based on density functional theory have been used to determine the possible source of failure of boron carbide just above the Hugoniot elastic limit (HEL). A range of B4C polytypes is found to be stable at room pressure. The energetic barrier for shock amorphization of boron carbide is by far the lowest for the B12(CCC) polytype, requiring only 6 GPa approximately = P(HEL) for collapse under hydrostatic conditions. The results clearly demonstrate that the collapse of the B12(CCC)… Show more

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Cited by 150 publications
(149 citation statements)
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“…Irrespective of grain orientation 18,19 , GBs in B 4 C are structurally sharp and free of glassy oxide nanolayer films typically observed in other ceramics. [17][18][19] Because the structure and chemistry of GBs have been shown to have a strong impact on the densification, microstructures, and mechanical properties of other ceramics such as silicon carbide (SiC) and silicon nitride (Si 3 N 4 ), it is critical to understand the atomic structures within GBs regions.…”
Section: Introductionmentioning
confidence: 83%
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“…Irrespective of grain orientation 18,19 , GBs in B 4 C are structurally sharp and free of glassy oxide nanolayer films typically observed in other ceramics. [17][18][19] Because the structure and chemistry of GBs have been shown to have a strong impact on the densification, microstructures, and mechanical properties of other ceramics such as silicon carbide (SiC) and silicon nitride (Si 3 N 4 ), it is critical to understand the atomic structures within GBs regions.…”
Section: Introductionmentioning
confidence: 83%
“…[1][2][3][4][5][6][7][8][9][10] However, engineering applications of B 4 C to body armor or abrasive powders have been impeded by the abnormal brittle failure under high pressure due to amorphous shear band formation. 5,10,11 Amorphous bands had also been observed in both simulated shear and scratch experiments, [11][12][13][14] suggesting that it is a major failure mechanism in B 4 C, but it is not known what role is played by grain boundaries (GBs).…”
Section: Introductionmentioning
confidence: 99%
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