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

Sliwa, Marcin; McGonegle, David; Wehrenberg, Christopher; Bolme, C. A.; Heighway, Patrick; Higginbotham, Andrew; Lazicki, Amy; Lee, Hae Ja; Nagler, Bob; Park, H. S.; Rudd, Robert E.; Suggit, Matthew; Swift, Damian; Tavella, F.; Zepeda-Ruiz, Luis A.; Remington, B. A.; Wark, J. S.

doi:10.1103/physrevlett.120.265502

Cited by 64 publications

(27 citation statements)

References 63 publications

(68 reference statements)

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“…Moreover, in SC-Ta along [001] direction, most of the twins nucleated in SI and SII are annihilated during SIII and SIV, due to the relaxation of the shear stress. Such de-twinning has been reported for Ta 23 and is believed to be responsible for the lack of twinning observed in shock-recovered microstructures in previous investigations 55 . However, this is not the case for the Cu/Ta multilayers with the OT interface, where most of the twins are retained.…”

Section: Resultssupporting

confidence: 68%

“…(b) Does the observed length scale dependence of spall strength values for the multilayered structures also exist for all interface structures? While the current state-of-art experimental capabilities use in situ femtosecond XRD for characterization of deformation mechanisms under shock loading conditions [23][24][25] , such questions are still very challenging to explore experimentally, given both the small length scales of the phenomena and the short time scales over which they occur.Molecular dynamics (MD) simulations can provide atomic-scale resolution of the processes occurring under dynamic loading conditions, thus enabling us to unravel the microstructural features contributing to the shock response and spall failure behavior [26][27][28][29][30][31][32] . While MD simulations have provided valuable insights on the role of interface structure and spacing on the defect (dislocations, twins) nucleation, evolution and transmission behavior in multilayered microstructures [33][34][35][36][37][38][39] , the understanding of the shock response and spall failure behavior is still in infancy.…”

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Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems

Chen

Mathaudhu

Thadhani

et al. 2020

Sci Rep

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Molecular dynamics (MD) simulations are carried out to investigate the effects of the type and spacing of fcc/Bcc interfaces on the deformation and spall behavior. the simulations are carried out using model Cu/Ta multilayers with six different types of interfaces. The results suggest that interface type can significantly affect the structure and intensity of the incoming shock wave, change the activated slip systems, alter dislocation slip and twinning behavior, affect where and how voids are nucleated during spallation and the resulting spall strength. Moreover, the above aspects are significantly affected by the interface spacing. A transition from homogeneous to heterogeneous dislocation nucleation occurs as the interface spacing is decreased to 6 nm. Depending on interface type and spacing, damage (voids) nucleation and spall failure is observed to occur not only at the Cu/Ta interfaces, but also in the weaker Cu layer interior, or even in the stronger Ta layer interior, although different mechanisms underlie each of these three distinct failure modes. These findings point to the fact that, depending on the combination of interface type and spacing, interfaces can lead to both strengthening and weakening of the cu/ta multilayered microstructures.Nanoscale multilayered materials are an emerging class of materials that render a unique combination of high thermal stability, strength, and damage resistance 1,2 . This unique response is due to a high density of interfaces in the microstructure that can be used to tailor their performance. Multilayer microstructures, therefore, are very promising materials for next-generation damage-tolerant applications. Recent advancements in experimental capabilities based on accumulative roll bonding (ARB) 3 , and physical vapor deposition (PVD) 4 has enabled the fabrication of a wide range of novel FCC/BCC bi-metallic multilayered microstructures. Such capabilities open up opportunities to tailor the interface structure and spacing in designing damage-resistant microstructures.A substantial amount of research, therefore, aims to understand the role of interfaces on the mechanical behavior of nanoscale multilayers 5-12 . Like grain boundaries in the nanocrystalline metals, bi-metallic interfaces are expected to result in significant differences in the deformation mechanisms of the multilayered microstructure as compared to their single-phase counterparts, by acting as sources or sinks for dislocation nucleation, or as barriers to dislocation propagation 13 . The capability of the bi-metallic interfaces to hinder dislocation propagation critically determines the strength of the multilayers 7,14 . This capability is also affected by the local atomic structure of the interface. For example, Zheng et al. 15 showed that for Cu/Nb multilayers, a faceted interface such as the KS112 interface could significantly promote twinning, due to the presence of atomic steps and the associated misfit dislocations with out-of-plane Burgers' vector that act as sources for nucleating twinning part...

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Section: Resultssupporting

confidence: 68%

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confidence: 99%

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confidence: 99%

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Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems

Chen

Mathaudhu

Thadhani

et al. 2020

Sci Rep

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“…The high energy drive at the NIF enables a large hohlraum and thus a large planar drive combined with a low-density foam-based multilayer reservoir to keep the temperature below melt during compression. The observed growth factor for Pb is described well by simulations using the ISG flow stress model for high-pressure bcc Pb, without explicitly accounting for the transformations to reach bcc or changes to the grain structure or any plastic reversion during release [47]. The inferred peak flow stress of ∼4.5 GPa and plateau average of ∼3.8 GPa is much higher than at ambient conditions.…”

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confidence: 70%

Soft Metal Gains Hulk-Like Strength

Gleason

2019

Physics

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We study the high-pressure strength of Pb and Pb-4wt%Sb at the National Ignition Facility. We measure Rayleigh-Taylor growth of preformed ripples ramp compressed to ∼400 GPa peak pressure, among the highest-pressure strength measurements ever reported on any platform. We find agreement with 2D simulations using the Improved Steinberg-Guinan strength model for body-centered-cubic Pb; the Pb-4wt %Sb alloy behaves similarly within the error bars. The combination of high-rate, pressure-induced hardening and polymorphism yield an average inferred flow stress of ∼3.8 GPa at high pressure, a ∼250-fold increase, changing Pb from soft to extremely strong.

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“…Coherent x-ray diffraction [28][29][30][31], in particular, has long been used to determine the microscopic structures of molecules, solids, and proteins because of itsångström resolution and deep penetration depth [32]. With the recent development of femtosecond (fs) x-ray sources, time-resolved coherent x-ray diffraction (using a pump-probe scheme) has been shown capable of directly imaging the transient structures along a reaction path [33][34][35][36][37][38][39][40][41][42], thereby providing deeper insight into the underlying reaction mechanisms. Theories have also been developed to simulate and interpret the timeresolved diffraction images in terms of target electronic or molecular motions [43][44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Violation of centrosymmetry in time-resolved coherent x-ray diffraction from rovibrational states of diatomic molecules

Shao

Starace

2019

Phys. Rev. A

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Owing to increasing applications of time-resolved coherent x-ray scattering for the investigation of molecular reaction dynamics, we develop a theoretical model for time-dependent x-ray diffraction from molecular and/or electronic motion in molecules. Our model shows that the violation of centrosymmetry (voc) is a general phenomenon in time-resolved diffraction patterns. We employ our theoretical model to illustrate the voc in time-resolved coherent x-ray diffraction from two oriented diatomic molecules undergoing ro-vibrational motion: lithium hydride (LiD) and hydrogen (HD). Our simulations show asymmetric x-ray diffraction images that reflect the directions of the molecular motions.

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

Cited by 64 publications

References 63 publications

Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems

Unraveling the Role of Interfaces on the Spall Failure of Cu/Ta Multilayered Systems

Soft Metal Gains Hulk-Like Strength

Violation of centrosymmetry in time-resolved coherent x-ray diffraction from rovibrational states of diatomic molecules

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