Multiscale characterization of irradiation behaviour of ion-irradiated SiC/SiC composites
Abstract
Here, the irradiation tolerance of SiC/SiC composites was studied using 10 MeV Au ion irradiations at 350 °C, for surface doses between 1 and 50 displacements per atom (dpa). Atomic force microscopy and optical profilometry revealed irradiation-induced axial and radial shrinkage of SiC-fibers. At 50 dpa, net fiber shrinkage reached 2.8 ± 0.3%. We conclude that the primary cause of SiC-fiber shrinkage in SiC/SiC composites is the irradiation-induced loss of pre-existing carbon packets, which had occupied 2–3% fiber volume in unirradiated state. A compelling evidence of the carbon packet loss was revealed using a combination of state-of-art conventional transmission electron microscopy (TEM), high resolution TEM, energy-filtered TEM and electron energy loss spectroscopy. Additionally, the carbon packet volume fraction decreased with increasing dose, reaching near-complete loss after 50 dpa. Carbon packet loss was further confirmed using Raman spectroscopy where the carbon D and G peaks disappeared after irradiation. In contrast, irradiation-induced swelling of 1 ± 0.5% was observed in the matrix after 50 dpa. The study also shows that up to 50 dpa, the multilayer pyrolytic-carbon (PyC) interface in the composite is highly irradiation tolerant as it maintained its morphology, graphitic nature and showed no signs of amorphization. Additionally, Raman spectroscopymore »
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1474616
- Alternate Identifier(s):
- OSTI ID: 1636946
- Grant/Contract Number:
- AC05-00OR22725; NE0008577
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 161; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Silicon carbide (SiC); Implantation/irradiation; Transmission electron microscopy (TEM); Carbon; Raman spectroscopy
Citation Formats
Agarwal, Shradha, Duscher, Gerd J M, Zhao, Yajie, Crespillo, Miguel L., Katoh, Yutai, and Weber, William J. Multiscale characterization of irradiation behaviour of ion-irradiated SiC/SiC composites. United States: N. p., 2018.
Web. doi:10.1016/j.actamat.2018.09.012.
Agarwal, Shradha, Duscher, Gerd J M, Zhao, Yajie, Crespillo, Miguel L., Katoh, Yutai, & Weber, William J. Multiscale characterization of irradiation behaviour of ion-irradiated SiC/SiC composites. United States. https://doi.org/10.1016/j.actamat.2018.09.012
Agarwal, Shradha, Duscher, Gerd J M, Zhao, Yajie, Crespillo, Miguel L., Katoh, Yutai, and Weber, William J. Tue .
"Multiscale characterization of irradiation behaviour of ion-irradiated SiC/SiC composites". United States. https://doi.org/10.1016/j.actamat.2018.09.012. https://www.osti.gov/servlets/purl/1474616.
@article{osti_1474616,
title = {Multiscale characterization of irradiation behaviour of ion-irradiated SiC/SiC composites},
author = {Agarwal, Shradha and Duscher, Gerd J M and Zhao, Yajie and Crespillo, Miguel L. and Katoh, Yutai and Weber, William J.},
abstractNote = {Here, the irradiation tolerance of SiC/SiC composites was studied using 10 MeV Au ion irradiations at 350 °C, for surface doses between 1 and 50 displacements per atom (dpa). Atomic force microscopy and optical profilometry revealed irradiation-induced axial and radial shrinkage of SiC-fibers. At 50 dpa, net fiber shrinkage reached 2.8 ± 0.3%. We conclude that the primary cause of SiC-fiber shrinkage in SiC/SiC composites is the irradiation-induced loss of pre-existing carbon packets, which had occupied 2–3% fiber volume in unirradiated state. A compelling evidence of the carbon packet loss was revealed using a combination of state-of-art conventional transmission electron microscopy (TEM), high resolution TEM, energy-filtered TEM and electron energy loss spectroscopy. Additionally, the carbon packet volume fraction decreased with increasing dose, reaching near-complete loss after 50 dpa. Carbon packet loss was further confirmed using Raman spectroscopy where the carbon D and G peaks disappeared after irradiation. In contrast, irradiation-induced swelling of 1 ± 0.5% was observed in the matrix after 50 dpa. The study also shows that up to 50 dpa, the multilayer pyrolytic-carbon (PyC) interface in the composite is highly irradiation tolerant as it maintained its morphology, graphitic nature and showed no signs of amorphization. Additionally, Raman spectroscopy revealed a saturation of TEM invisible disorder at 1 dpa for both ultra-fine grains of the fiber and the larger SiC-matrix grains. However, TEM visible extended defect formation such as dislocation loops were only detected in the larger matrix grains, thereby revealing a potential role of grain size on defect accumulation in SiC.},
doi = {10.1016/j.actamat.2018.09.012},
journal = {Acta Materialia},
number = C,
volume = 161,
place = {United States},
year = {Tue Sep 11 00:00:00 EDT 2018},
month = {Tue Sep 11 00:00:00 EDT 2018}
}
Web of Science
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Works referencing / citing this record:
Microstructure of SiC fibers by swift heavy ion beam irradiation
journal, July 2019
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