Molecular dynamics simulations of shock compression of nickel: From monocrystals to nanocrystals

Jarmakani, H.; Bringa, Eduardo M.; Erhart, Paul; Remington, B. A.; Wang, Y.M.; Vo, Nhon Q.; Meyers, Marc A.

doi:10.1016/j.actamat.2008.07.052

Cited by 123 publications

(49 citation statements)

References 70 publications

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“…To estimate the slip-to-twinning transition at high strain rate and under shock compression, Meyers et al [62] developed an analysis that has been successfully applied to copper [63] and nickel [64]. It is based on the simple premise that slip and twinning are competing mechanisms, and that the one requiring the lowest applied shear stress operates.…”

Section: Constitutive Description Of the Slip-to-twinning Transitionmentioning

confidence: 99%

Growth and collapse of nanovoids in tantalum monocrystals

et al. 2011

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Section: Constitutive Description Of the Slip-to-twinning Transitionmentioning

confidence: 99%

Growth and collapse of nanovoids in tantalum monocrystals

et al. 2011

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“…This work was extended to nickel by Jarmakani et al [4] and monocrystalline tantalum by Meyers et al [5]. The objective of this study is to extend the methodology developed to nanocrystalline tantalum and to investigate the effect of the grain size.…”

Section: Introductionmentioning

confidence: 99%

Laser compression of nanocrystalline tantalum

Lu¹,

Maddox²,

Remington³

et al. 2012

AIP Conference Proceedings

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Abstract. Nanocrystalline tantalum was prepared by high pressure torsion from monocrystalline [100] stock, yielding a grain size of 70nm. It was subjected to laser driven compression at energy levels of ~ 350 J to ~ 850 J in the Omega facility (LLE, U. of Rochester) with corresponding pressures as high as ~ 170 GPa. The laser beam created a crater of significant depth (~ 100 µm). Transmission electron microscopy (TEM) revealed dislocations in the grains but no twins in contrast with monocrystalline tantalum. Hardness measurements were conducted and show the same trend as single crystalline tantalum. The grain size was found to increase close to the energy deposition surface due to the thermomechanical excursion.

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“…A resolution to this discrepancy is suggested by further MD simulations that show that upon the shock unloading at a free surface, and subsequent rarefaction, most of the dislocations annihilate [10] implying that post facto analysis of recovered samples may at best not provide a full picture of the conditions present during the passage of the shock itself. The large defect densities thought to be present under shock compression may also be pertinent to apparent contradictions in measured melting temperatures at high pressure [11][12][13].…”

mentioning

confidence: 99%

Femtosecond X-Ray Diffraction Studies of the Reversal of the Microstructural Effects of Plastic Deformation during Shock Release of Tantalum

et al. 2018

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We have used femtosecond x-ray diffraction (XRD) to study laser-shocked fiber-textured polycrystalline tantalum targets as the 37-253 GPa shock waves break out from the free surface. We extract the time and depth-dependent strain profiles within the Ta target as the rarefaction wave travels back into the bulk of the sample. In agreement with molecular dynamics (MD) simulations the lattice rotation and the twins that are formed under shock-compression are observed to be almost fully eliminated by the rarefaction process.

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Molecular dynamics simulations of shock compression of nickel: From monocrystals to nanocrystals

Cited by 123 publications

References 70 publications

Growth and collapse of nanovoids in tantalum monocrystals

Growth and collapse of nanovoids in tantalum monocrystals

Laser compression of nanocrystalline tantalum

Femtosecond X-Ray Diffraction Studies of the Reversal of the Microstructural Effects of Plastic Deformation during Shock Release of Tantalum

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