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.
read more
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.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Impact Velocity-Dependent Patterns and Mechanisms of Spalling Behavior in Single Crystal Nickel
Wang Lu-sheng,Lida Luo,Jun Zhao,Xin Yang,Jun Ding,Kaijun Song,Lin Shi-qing,Xia Huang +7 more
TL;DR: This study investigates the impact velocity-dependent spalling behavior in single crystal nickel, revealing a critical velocity of 1.5 km/s and two spallation mechanisms, with dislocation and phase transformation influencing spalling strength at different velocities.
On the entropic nucleation barrier in a martensitic transformation
Oliver Kastner,Roni Z. Shneck +1 more
TL;DR: In this paper, the authors investigate the nature of the entropic barrier by means of molecular dynamics simulations and examine two nucleation events observed under adiabatic conditions using vibrational mode analysis of the atomic trajectories.
Molecular-dynamics investigation of the fcc → bcc phase transformation in Fe
Cemal Engin,Herbert M. Urbassek +1 more
TL;DR: In this paper, the influence of internal and external constraints on the dynamics of an fcc → bcc transformation was studied using molecular-dynamics simulation. And the authors found that the transformation proceeds spontaneously even at 0 K, when a grain boundary is introduced whose large free volume helps to accommodate the structural transformation.
From microjoules to megajoules and kilobars to gigabars: Probing matter at extreme states of deformation
TL;DR: There has been an exponential increase in work done in the newly emerging field of matter at extreme states of deformation and compression over the past three decades, due to the confluence of new experimental facilities, experimental techniques, theory, and simulations as mentioned in this paper.
References
•Book
The Art of Molecular Dynamics Simulation
D. C. Rapaport
- 28 Apr 1997
TL;DR: This book describes the extremely powerful technique of molecular dynamics simulation, which involves solving the classical many-body problem in contexts relevant to the study of matter at the atomic level.
4.3K
•Book
Dynamic Behavior of Materials
Marc A. Meyers
- 27 Sep 1994
TL;DR: In this paper, the authors present a method to produce dynamic deformation at high strain rates by using Shear Bands (Thermoplastic Shear Instabilities) and dynamic fracture.
3.3K
Modified embedded-atom potentials for cubic materials and impurities
TL;DR: In a comprehensive study, the modified embedded-atom method is extended to a variety of cubic materials and impurities, including metals, semiconductors, and diatomic gases, all of which exhibit different types of bonding.
2K
The embedded-atom method: a review of theory and applications
TL;DR: The embedded-atom method (EAM) as mentioned in this paper is a semi-empirical method for performing calculations of defects in metals, and it has been shown to provide a very useful and robust means of calculating approximate structure and energetics.
1.6K