Nonisentropic Release of a Shocked Solid

Heighway, Patrick; Sliwa, Marcin; McGonegle, David; Bolme, Cynthia; Eggert, J. H.; Higginbotham, Andrew; Lazicki, Amy; Lee, Hae Ja; Nagler, Bob; Park, Hyesook; Rudd, Robert E.; Smith, R. F.; Suggit, Mathew; Swift, Damian; Tavella, F.; Remington, B. A.; Wark, J. S.

doi:10.1103/physrevlett.123.245501

Cited by 17 publications

(14 citation statements)

References 62 publications

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“…The metastable ω phase is well known to become highly unfavorable relative to the stable α phase at elevated temperatures, which explains why complete reversion was observed in our MEC experiments [28,[33][34][35]. While it has recently been reported that the early stages of rapid release from high pressure at a free surface can be highly nonisentropic due to plastic work heating induced by material strength [36], the level of sample heating in our experiments [Fig. 2(c)] was unexpected [37] and indicated an additional source of heating, which inhibited the recovery of the high-pressure ω phase.…”

Section: In Situ X-ray Diffraction Experiments At Mecsupporting

confidence: 50%

Recovery of a high-pressure phase formed under laser-driven compression

et al. 2020

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The recovery of metastable structures formed at high pressure has been a long-standing goal in the field of condensed matter physics. While laser-driven compression has been used as a method to generate novel structures at high pressure, to date no high-pressure phases have been quenched to ambient conditions. Here we demonstrate, using in situ x-ray diffraction and recovery methods, the successful quench of a high-pressure phase which was formed under laser-driven shock compression. We show that tailoring the pressure release path from a shock-compressed state to eliminate sample spall, and therefore excess heating, increases the recovery yield of the high-pressure ω phase of zirconium from 0% to 48%. Our results have important implications for the quenchability of novel phases of matter demonstrated to occur at extreme pressures using nanosecond laser-driven compression.

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Section: In Situ X-ray Diffraction Experiments At Mecsupporting

confidence: 50%

Recovery of a high-pressure phase formed under laser-driven compression

et al. 2020

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“…These temperatures are significantly higher than the postshock temperatures expected along the isentropic release paths (<500 K) (Figure 2), which should result in a volume expansion of less than 1% at 1 bar. Recent molecular dynamic simulations and shock experiments (Heighway et al., 2019) have reported that the postshock temperature of tantalum exceeds the values predicted by isentropic release. This difference is primarily explained by plastic‐work heating with an additional contribution from heat released by the defects.…”

Section: Discussionmentioning

confidence: 98%

Femtosecond X‐Ray Diffraction of Laser‐Shocked Forsterite (Mg₂SiO₄) to 122 GPa

et al. 2021

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Mg-rich olivine (Mg,Fe) 2 SiO 4 , occurs widely in igneous and metamorphic rocks, and is the dominant phase in Earth's upper mantle (Ringwood, 1991). The physical properties of liquid Mg 2 SiO 4 are important for modeling partial melting of the mantle and the behavior of magma oceans (Mosenfelder et al., 2007). In addition, olivine is a common constituent of terrestrial planets (Mustard et al., 2005) and meteorites (Mason, 1963), and is also found in comets (Hanner, 1999), presolar grains (Nguyen & Zinner, 2004), and in accretion disks around young stars (van Boekel et al., 2004). Static-compression experiments have shown that at high pressure and temperature (>1,000 K), (Mg,Fe) 2 SiO 4 adopts a spinelloid structure (wadsleyite) at about ∼14 GPa, and then transforms to a spinel structure (ringwoodite) at ∼18 GPa (Frost, 2008). At 24 GPa, ringwoodite dissociates into (Mg,Fe) SiO 3 , bridgmanite and (Mg,Fe)O, ferropericlase which are expected to be the major phases of Earth's lower mantle. These phase transitions in the (Mg,Fe) 2 SiO 4 system are the primary cause of the ma

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“…To study plasticity-induced rotation in tantalum and copper under dynamic loading conditions, we perform classical molecular dynamics (MD) simulations with the open-source code lammps [29]. Atomic interactions in tantalum are modeled using the Ravelo Ta1 potential [30], which successfully reproduces the equation of state, elastic constants, Hugoniot particle velocities [31], and several other high-pressure properties [32][33][34] of tantalum in the megabar regime, and has come to be widely used in atomistic studies of tantalum under extreme loading conditions [14,16,[35][36][37][38][39][40]. For copper, we use the wellestablished Mishin potential [41], which has been used extensively in simulations of shock-loaded copper [42][43][44][45][46][47], and is thus well-characterized in the high-pressure regime of interest here.…”

Section: Methodology a Simulation Setupmentioning

confidence: 99%

“…The first of the three cases we consider is body-centered cubic (bcc) tantalum compressed along its [101] direction. Tantalum has garnered considerable interest from the dynamic compression community [14,16,30,39,40,[51][52][53][54][55][56][57] in part due to its high phase stability along the Hugoniot. Under shock, tantalum is thought to retain its ambient bcc structure until it shock-melts at pressures of around 300 GPa [14].…”

Section: A [101] Tantalummentioning

confidence: 99%

Slip competition and rotation suppression in tantalum and copper during dynamic uniaxial compression

Heighway¹,

Wark²

2022

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When compressed, a metallic specimen will generally experience changes to its crystallographic texture due to plasticity-induced rotation. Ultrafast x-ray diffraction techniques make it possible to measure rotation of this kind in targets dynamically compressed over nanosecond timescales to the kind of pressures ordinarily encountered in planetary interiors. The axis and the extent of the local rotation can provide hints as to the combination of plasticity mechanisms activated by the rapid uniaxial compression, thus providing valuable information about the underlying dislocation kinetics operative during extreme loading conditions. We present large-scale molecular dynamics simulations of shock-induced lattice rotation in three model crystals whose behavior has previously been characterized in dynamic-compression experiments: tantalum shocked along its [101] direction, and copper shocked along either [001] or [111]. We find that, in all three cases, the texture changes predicted by the simulations are consistent with those measured experimentally using in situ x-ray diffraction. We show that while tantalum loaded along [101] and copper loaded along [001] both show pronounced rotation due to asymmetric multiple slip, the orientation of copper shocked along [111] is predicted to be stabilized by opposing rotations arising from competing, symmetrically equivalent slip systems.

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Nonisentropic Release of a Shocked Solid

Cited by 17 publications

References 62 publications

Recovery of a high-pressure phase formed under laser-driven compression

Recovery of a high-pressure phase formed under laser-driven compression

Femtosecond X‐Ray Diffraction of Laser‐Shocked Forsterite (Mg₂SiO₄) to 122 GPa

Slip competition and rotation suppression in tantalum and copper during dynamic uniaxial compression

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Nonisentropic Release of a Shocked Solid

Cited by 17 publications

References 62 publications

Recovery of a high-pressure phase formed under laser-driven compression

Recovery of a high-pressure phase formed under laser-driven compression

Femtosecond X‐Ray Diffraction of Laser‐Shocked Forsterite (Mg2SiO4) to 122 GPa

Slip competition and rotation suppression in tantalum and copper during dynamic uniaxial compression

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Femtosecond X‐Ray Diffraction of Laser‐Shocked Forsterite (Mg₂SiO₄) to 122 GPa