J
James Hawreliak
Researcher at Lawrence Livermore National Laboratory
Publications - 87
Citations - 2421
James Hawreliak is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Diffraction & Shock (mechanics). The author has an hindex of 23, co-authored 84 publications receiving 2091 citations. Previous affiliations of James Hawreliak include Washington State University & University of Oxford.
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Journal ArticleDOI
Direct Observation of the alpha-epsilon Transition in Shock-compressed Iron via Nanosecond X-ray Diffraction
Daniel H. Kalantar,James Belak,Gilbert Collins,J. D. Colvin,H. M. Davies,Jon Eggert,Timothy C. Germann,James Hawreliak,Brad Lee Holian,Kai Kadau,Peter S. Lomdahl,Hector Lorenzana,Marc A. Meyers,K. Rosolankova,Matt S. Schneider,J. Sheppard,James S. Stolken,Justin Wark +17 more
TL;DR: In situ x-ray diffraction studies of iron under shock conditions confirm unambiguously a phase change from the bcc (alpha) to hcp (epsilon) structure, and are in good agreement with large-scale nonequilibrium molecular dynamics simulations.
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Shock deformation of face-centred-cubic metals on subnanosecond timescales
Eduardo M. Bringa,K. Rosolankova,Robert E. Rudd,B. A. Remington,Justin Wark,Mark A. Duchaineau,Daniel H. Kalantar,James Hawreliak,James Belak +8 more
TL;DR: Large-scale molecular dynamics simulations of shock-wave propagation through a metal allowing a detailed analysis of the dynamics of high strain-rate plasticity resolve the important discrepancy in the evolution of the strain from one- to three-dimensional compression observed in diffraction experiments.
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Experimental evidence for a phase transition in magnesium oxide at exoplanet pressures
Federica Coppari,Raymond F. Smith,Jon Eggert,Jue Wang,J. R. Rygg,Amy Lazicki,James Hawreliak,Gilbert Collins,Thomas S. Duffy +8 more
TL;DR: In this paper, the authors show that ramp-compressed magnesium oxide, an important component of Earth's mantle, has a solid-solid state transition at about 600 GPa, with a high-pressure structure that is stable up to 900 GPa.
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Ultrafast visualization of crystallization and grain growth in shock-compressed SiO2.
Arianna Gleason,Cynthia Bolme,Hae Ja Lee,Bob Nagler,Eric Galtier,Despina Milathianaki,James Hawreliak,R. G. Kraus,Jon Eggert,Dayne Fratanduono,Gilbert Collins,Richard L. Sandberg,Wenge Yang,Wendy L. Mao +13 more
TL;DR: In situ pump–probe XRD measurements on shock-compressed fused silica reveal an amorphous to crystalline high-pressure stishovite phase transition, and the functional form of this grain growth suggests homogeneous nucleation and attachment as the growth mechanism.
Journal ArticleDOI
Material dynamics under extreme conditions of pressure and strain rate
Bruce Remington,P. G. Allen,Eduardo M. Bringa,James Hawreliak,D. Ho,K. T. Lorenz,Hector Lorenzana,James McNaney,Marc A. Meyers,S. W. Pollaine,K. Rosolankova,B. Sadik,M. S. Schneider,Damian Swift,Justin Wark,B. Yaakobi +15 more
TL;DR: In this article, the authors compared 2D continuum simulations with experiments measuring perturbation growth from the Rayleigh-Taylor instability in solid state samples and deduced the microscopic dislocation dynamics that underlies this 1D-3D lattice relaxation.