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
Ultrafast Optical Measurements of Shocked Materials
David J. Funk,David S. Moore,Shawn McGrane +2 more
- 01 Jan 2007
TL;DR: In this paper, it was shown that when an energetic polymer, PVN, is shocked to ∼200 kbar, they observe a disappearance of the NO2 vibration infrared absorption(s), indicating chemical reaction as the Shockwave traverses the film.
1
Picosecond X-ray diffraction studies of shocked single crystals
Justin Wark,J. Belak,Gilbert Collins,J. D. Colvin,Huw Davies,Mark A. Duchaineau,Jon Eggert,Timothy C. Germann,James Hawreliak,Andrew Higginbotham,Brad Lee Holian,Kai Kadau,Daniel H. Kalantar,Peter S. Lomdahl,Hector Lorenzana,Marc A. Meyers,William J. Murphy,Nigel Park,Bruce Remington,K. Rosolankova,Robert E. Rudd,M. S. Schneider,J. Sheppard,James S. Stolken +23 more
- 26 May 2006
TL;DR: In this article, the authors used laser-plasma generated X-rays to study how single crystals of metals (copper and iron) react to uniaxial shock compression, and observed rapid plastic flow (in the case of copper), and directly observed the famous alpha-epsilon transition in Iron.
1
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