| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
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| Presentation Title |
TEM Characterization of the Microstructural Changes in Fe-Cr Model Alloys Due to Neutron Irradiation at Intermediate Temperatures |
| Author(s) |
Dhriti Bhattacharyya, Alan Xu, G. Robert Odette, Takuya Yamamoto |
| On-Site Speaker (Planned) |
Dhriti Bhattacharyya |
| Abstract Scope |
A series of Fe-Cr alloys, with 3 at% - 18 at% Cr, was irradiated in the Advanced Test Reactor (ATR) at the Idaho National Labs (INL), USA, up to a dose of ~6.2 dpa at a temperature of ~456 °C. Transmission electron microscopy (TEM) samples were extracted using a focused ion beam (FIB) instrument, and the resulting microstructural defects, such as voids, dislocation loops, network dislocations, Cr rich precipitates, etc., were characterized using conventional TEM, STEM and Energy Filtered TEM. It was found that the size and number density of these defects varied widely over the different alloys with varying Cr content. Cr rich precipitates start appearing only at or above 12% Cr. Grain boundary segregation of Cr along with a precipitate free zone was also observed. Dislocation loops of both ½<111> and <100> type were found, and their nature and habit planes were determined using amplitude contrast image simulation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Other |