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Title: Shock compression of [001] single crystal silicon

Silicon is ubiquitous in our advanced technological society, yet our current understanding of change to its mechanical response at extreme pressures and strain-rates is far from complete. This is due to its brittleness, making recovery experiments difficult. High-power, short-duration, laser-driven, shock compression and recovery experiments on [001] silicon (using impedance-matched momentum traps) unveiled remarkable structural changes observed by transmission electron microscopy. As laser energy increases, corresponding to an increase in peak shock pressure, the following plastic responses are are observed: surface cleavage along {111} planes, dislocations and stacking faults; bands of amorphized material initially forming on crystallographic orientations consistent with dislocation slip; and coarse regions of amorphized material. Molecular dynamics simulations approach equivalent length and time scales to laser experiments and reveal the evolution of shock-induced partial dislocations and their crucial role in the preliminary stages of amorphization. Furthermore, application of coupled hydrostatic and shear stresses produce amorphization below the hydrostatically determined critical melting pressure under dynamic shock compression.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. Nacional de Cuyo, Mendoza (Argentina); CONICET, Mendoza (Argentina)
Publication Date:
OSTI Identifier:
1281662
Report Number(s):
LLNL-JRNL--696497
Journal ID: ISSN 1951-6355
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. Special Topics
Additional Journal Information:
Journal Volume: 225; Journal Issue: 2; Journal ID: ISSN 1951-6355
Publisher:
Springer
Research Org:
Lawrence Livermore National Lab., Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; 42 ENGINEERING laser shock; silicon; amorphization; molecular dynamics