Shock-induced amorphization in silicon carbide
While silicon carbide (SiC) has been predicted to undergo pressure-induced amorphization, the microstructural evidence of such a drastic phase change is absent as its brittleness usually prevents its successful recovery from high-pressure experiments. In this paper we report on the observation of amorphous SiC recovered from laser-ablation-driven shock compression with a peak stress of approximately 50 GPa. Transmission electron microscopy reveals that the amorphous regions are extremely localized, forming bands as narrow as a few nanometers. In addition to these amorphous bands, planar stacking faults are observed. Large-scale non-equilibrium molecular dynamic simulations elucidate the process and suggest that the planar stacking faults serve as the precursors to amorphization. Finally, our results suggest that the amorphous phase produced is a high-density form, which enhances its thermodynamical stability under the high pressures combined with the shear stresses generated by the uniaxial strain state in shock compression.
- Authors:
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[1]
; [1]
; [2]
; [1]
; [3]
; [3]
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[1]
- Univ. of California, San Diego, CA (United States)
- Univ. of California, San Diego, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Report Number(s):
- LLNL-JRNL-754814
Journal ID: ISSN 1359-6454; PII: S1359645418305834
- Grant/Contract Number:
- NA0002930; FG52-09NA29043; AC52-07NA27344; 09-LR-06-118456-MEYM; LFR-17-449059
- Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 158; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Research Org:
- Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. of California (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; silicon carbide; amorphization; laser shock compression; Lasers
- OSTI Identifier:
- 1462276
- Alternate Identifier(s):
- OSTI ID: 1479061
Zhao, S., Flanagan, R., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Cauble, R., More, K., and Meyers, M. A.. Shock-induced amorphization in silicon carbide. United States: N. p.,
Web. doi:10.1016/j.actamat.2018.07.047.
Zhao, S., Flanagan, R., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Cauble, R., More, K., & Meyers, M. A.. Shock-induced amorphization in silicon carbide. United States. doi:10.1016/j.actamat.2018.07.047.
Zhao, S., Flanagan, R., Hahn, E. N., Kad, B., Remington, B. A., Wehrenberg, C. E., Cauble, R., More, K., and Meyers, M. A.. 2018.
"Shock-induced amorphization in silicon carbide". United States.
doi:10.1016/j.actamat.2018.07.047.
@article{osti_1462276,
title = {Shock-induced amorphization in silicon carbide},
author = {Zhao, S. and Flanagan, R. and Hahn, E. N. and Kad, B. and Remington, B. A. and Wehrenberg, C. E. and Cauble, R. and More, K. and Meyers, M. A.},
abstractNote = {While silicon carbide (SiC) has been predicted to undergo pressure-induced amorphization, the microstructural evidence of such a drastic phase change is absent as its brittleness usually prevents its successful recovery from high-pressure experiments. In this paper we report on the observation of amorphous SiC recovered from laser-ablation-driven shock compression with a peak stress of approximately 50 GPa. Transmission electron microscopy reveals that the amorphous regions are extremely localized, forming bands as narrow as a few nanometers. In addition to these amorphous bands, planar stacking faults are observed. Large-scale non-equilibrium molecular dynamic simulations elucidate the process and suggest that the planar stacking faults serve as the precursors to amorphization. Finally, our results suggest that the amorphous phase produced is a high-density form, which enhances its thermodynamical stability under the high pressures combined with the shear stresses generated by the uniaxial strain state in shock compression.},
doi = {10.1016/j.actamat.2018.07.047},
journal = {Acta Materialia},
number = ,
volume = 158,
place = {United States},
year = {2018},
month = {7}
}