Supersonic Dislocation Bursts in Silicon

Hahn, E. N.; Zhao, S.; Bringa, E. M.; Meyers, M. A.

doi:10.1038/srep26977

Title: Supersonic Dislocation Bursts in Silicon

Journal Article · Mon Jun 06 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep26977· OSTI ID:1280869

Hahn, E. N. ^[1]; Zhao, S. ^[1]; Bringa, E. M. ^[2]; Meyers, M. A. ^[1]

Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program
Universidad Nacional de Cuyo, Mendoza (Argentina), Ciencias Exactas y Naturales; CONICET, Mendoza (Argentina)

Dislocations are the primary agents of permanent deformation in crystalline solids. Since the theoretical prediction of supersonic dislocations over half a century ago, there is a dearth of experimental evidence supporting their existence. Here we use non-equilibrium molecular dynamics simulations of shocked silicon to reveal transient supersonic partial dislocation motion at approximately 15 km/s, faster than any previous in-silico observation. Homogeneous dislocation nucleation occurs near the shock front and supersonic dislocation motion lasts just fractions of picoseconds before the dislocations catch the shock front and decelerate back to the elastic wave speed. Applying a modified analytical equation for dislocation evolution we successfully predict a dislocation density of 1.5 x 10(12) cm(-2) within the shocked volume, in agreement with the present simulations and realistic in regards to prior and on-going recovery experiments in silicon.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); UC Research Laboratories Grant

Grant/Contract Number:: NA0002080

OSTI ID:: 1280869

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Investigation of the elastically shock-compressed region and elastic–plastic shock transition in single-crystalline copper to understand the dislocation nucleation mechanism under shock compression Bisht, A.; Neogi, A.; Mitra, N. Shock Waves, Vol. 29, Issue 7 https://doi.org/10.1007/s00193-018-00887-8	journal	February 2019
Phase transition lowering in dynamically compressed silicon McBride, E. E.; Krygier, A.; Ehnes, A. Nature Physics, Vol. 15, Issue 1 https://doi.org/10.1038/s41567-018-0290-x	journal	September 2018
Intensification of shock damage through heterogeneous phase transition and dislocation loop formation due to presence of pre-existing line defects in single crystal Cu Reddy, K. Vijay; Deng, Chuang; Pal, Snehanshu Journal of Applied Physics, Vol. 126, Issue 17 https://doi.org/10.1063/1.5121841	journal	November 2019

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