About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Systems for the Future of Fusion Energy
|
Presentation Title |
Characterization of Atomic-scale Defects in Neutron Irradiated Silicon Carbide |
Author(s) |
Takaaki Koyanagi, David Sprouster, Xunxiang Hu, Yutai Katoh |
On-Site Speaker (Planned) |
Takaaki Koyanagi |
Abstract Scope |
The characterization of atomic-scale defects in silicon carbide (SiC), including Frenkel pairs, antisites, and small defect clusters, is the key to understanding the dynamic self-stabilizing mechanisms in certain ceramic compounds under irradiation. Although the configurations and energetics of such defects have been studied in theoretical simulations, experimental validation of the results has been limited. The objective of this study is to provide experimental information on atomic-scale defects in SiC to allow better modeling of the microstructural response in a fusion nuclear environment. We used three different techniques for the characterization of microstructures: Raman spectroscopy, positron annihilation spectroscopy, and high-energy x-ray diffraction. Based on the systematic investigation, we present experimental evidence showing how homonuclear bonds (Si-Si and C-C) and vacancy clusters develop under high-dose neutron irradiation. The research is sponsored by the U.S. Department of Energy, Office of Fusion Energy Sciences. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, Nuclear Materials, High-Temperature Materials |