| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Microstructural, Mechanical, and Chemical Behavior of Solid Nuclear Fuel and Fuel-Cladding Interface II
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| Presentation Title |
Effect of FIB Damage on the Defect Evolution in Ceramic Fuels Under In-Situ TEM Annealing |
| Author(s) |
Anshul Kamboj, Kaustubh Bawane, J. Matthew Mann, Marat Khafizov, David H. Hurley, Boopathy Kombaiah |
| On-Site Speaker (Planned) |
Anshul Kamboj |
| Abstract Scope |
In-situ thermal-annealing transmission electron microscopy (TEM) is a powerful technique for studying microstructural changes like phase transformations, atomic diffusion, and defect evolution. Recent studies have used this method to investigate the evolution of irradiation-induced defects such as dislocation loops and voids with temperature in ceramic fuel systems. Sample preparation for in-situ annealing typically involves using focused ion beam (FIB), where Ga ions can produce irradiation-induced defects. This study demonstrates that FIB-induced damage can have a significant impact on the resulting microstructure during in-situ TEM annealing. In a pristine CeO2 sample, a surrogate to UO2, prepared using FIB, the FIB induced defects under thermal activation interact with each other and result in the formation of dislocation loops and cavities at 900°C, 1100°C, and 1300°C. As the temperature increases, the number density of dislocation loops and voids decreases while their size increases, indicating coalescence and Ostwald ripening, respectively, as the controlling mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Ceramics |