Journal Article10.1126/SCIENCE.1070375
Microscopic View of Structural Phase Transitions Induced by Shock Waves
TL;DR: Multimillion-atom molecular-dynamics simulations are used to investigate the shock-induced phase transformation of solid iron, finding that the dynamics and orientation of the developing close-packed grains depend on the shock strength and especially on the crystallographic shock direction.
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Abstract: Multimillion-atom molecular-dynamics simulations are used to investigate the shock-induced phase transformation of solid iron. Above a critical shock strength, many small close-packed grains nucleate in the shock-compressed body-centered cubic crystal growing on a picosecond time scale to form larger, energetically favored grains. A split two-wave shock structure is observed immediately above this threshold, with an elastic precursor ahead of the lagging transformation wave. For even higher shock strengths, a single, overdriven wave is obtained. The dynamics and orientation of the developing close-packed grains depend on the shock strength and especially on the crystallographic shock direction. Orientational relations between the unshocked and shocked regions are similar to those found for the temperature-driven martensitic transformation in iron and its alloys.
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Citations
Revisiting the effect of shear stress on the γ→α phase transition of cerium under shock loading
TL;DR: Using large-scale atomistic simulations, this paper reported the γ→α phase transition (PT) of Ce under shock loading, which was in reasonable agreement with previous experiments, thus confirm the validity of the interatomic potential.
Molecular dynamics simulations of hcp/fcc nucleation and growth in bcc iron driven by uniaxial compression.
TL;DR: It is found that the transition pressures are less dependent on the crystal orientations, ∼14 GPa for [001], [011], and [111] loadings, however, the pressure interval of a mixed phase for [011] loading is much shorter than loading along other orientations.
Determining coherent reference states of general semicoherent interfaces
TL;DR: In this paper, a new method for determining the unique reference state in which the Burgers vectors of misfit dislocations in semicoherent interfaces are defined is presented, which requires cancelation of coherency and dislocation stresses far from the interface as well as consistency of far-field rotations with a prescribed interface crystallographic character.
Shock wave induced reversible phase transition from crystalline to semi-crystalline states of lithium sulfate monohydrate
TL;DR: In this article , the authors presented the shock wave induced reversible phase transition from crystalline to semi-crystalline states of lithium sulfate monohydrate (Li2SO4•H2O).
[High Resolution Laser Transient Spectroscopic Technology under Two-Stage Light Gas-Gun Loading Condition and Stability Study of Shocked Benzene].
Zhao Bei-jing,Liu Fu-sheng,Wang Wen-peng,Zhang Ning-chao,Feng Li-peng,Zhang Ming-jian,Xue +6 more
TL;DR: Researchers employed high-resolution laser transient spectroscopy to study shocked benzene under two-stage light gas-gun loading, observing linear pressure-dependent frequency shifts and structural changes at 9.7 GPa, exceeding previously reported thresholds.
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