skip to main content

DOE PAGESDOE PAGES

Title: Amorphization and nanocrystallization of silcon under shock compression

High-power, short-duration, laser-driven, shock compression and recovery experiments on [001] silicon unveiled remarkable structural changes above a pressure threshold. Two distinct amorphous regions were identified: (a) a bulk amorphous layer close to the surface and (b) amorphous bands initially aligned with {111} slip planes. Further increase of the laser energy leads to the re-crystallization of amorphous silicon into nanocrystals with high concentration of nano-twins. This amorphization is produced by the combined effect of high magnitude hydrostatic and shear stresses under dynamic shock compression. Shock-induced defects play a very important role in the onset of amorphization. Calculations of the free energy changes with pressure and shear, using the Patel-Cohen methodology, are in agreement with the experimental results. Molecular dynamics simulation corroborates the amorphization, showing that it is initiated by the nucleation and propagation of partial dislocations. As a result, the nucleation of amorphization is analyzed qualitatively by classical nucleation theory.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. National Univ. of Cuyo, Mendoza (Argentina); National Scientific and Technical Research Council (CONICET), Mendoza (Argentina)
Publication Date:
Report Number(s):
LLNL-JRNL-687429; DE-UCSD-0002080
Journal ID: ISSN 1359-6454
Grant/Contract Number:
AC52-07NA27344; 09-LR-06-118456-MEYM; PE-FG52-09NA-29043; NA0002080
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 103; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, La Jolla, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; laser shock compression; silicon; amorphization; nanocrystalline; nano-twinning
OSTI Identifier:
1260490
Alternate Identifier(s):
OSTI ID: 1397676; OSTI ID: 1462265

Zhao, S., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Bringa, E. M., and Meyers, M. A.. Amorphization and nanocrystallization of silcon under shock compression. United States: N. p., Web. doi:10.1016/j.actamat.2015.09.022.
Zhao, S., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Bringa, E. M., & Meyers, M. A.. Amorphization and nanocrystallization of silcon under shock compression. United States. doi:10.1016/j.actamat.2015.09.022.
Zhao, S., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Bringa, E. M., and Meyers, M. A.. 2015. "Amorphization and nanocrystallization of silcon under shock compression". United States. doi:10.1016/j.actamat.2015.09.022. https://www.osti.gov/servlets/purl/1260490.
@article{osti_1260490,
title = {Amorphization and nanocrystallization of silcon under shock compression},
author = {Zhao, S. and Hahn, E. N. and Kad, B. and Remington, B. A. and Wehrenberg, C. E. and Bringa, E. M. and Meyers, M. A.},
abstractNote = {High-power, short-duration, laser-driven, shock compression and recovery experiments on [001] silicon unveiled remarkable structural changes above a pressure threshold. Two distinct amorphous regions were identified: (a) a bulk amorphous layer close to the surface and (b) amorphous bands initially aligned with {111} slip planes. Further increase of the laser energy leads to the re-crystallization of amorphous silicon into nanocrystals with high concentration of nano-twins. This amorphization is produced by the combined effect of high magnitude hydrostatic and shear stresses under dynamic shock compression. Shock-induced defects play a very important role in the onset of amorphization. Calculations of the free energy changes with pressure and shear, using the Patel-Cohen methodology, are in agreement with the experimental results. Molecular dynamics simulation corroborates the amorphization, showing that it is initiated by the nucleation and propagation of partial dislocations. As a result, the nucleation of amorphization is analyzed qualitatively by classical nucleation theory.},
doi = {10.1016/j.actamat.2015.09.022},
journal = {Acta Materialia},
number = C,
volume = 103,
place = {United States},
year = {2015},
month = {11}
}