About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Developments in Advanced Nuclear Structural Materials
|
| Presentation Title |
Decoupling Irradiation and Thermal Effects on Nanocluster Evolution and RIS in 14YWT ODS |
| Author(s) |
Soumita Mondal, Amrita Sen, Janelle Wharry |
| On-Site Speaker (Planned) |
Soumita Mondal |
| Abstract Scope |
This study aims to decouple irradiation from thermal effects on the evolution of grain boundary (GB) radiation-induced segregation (RIS) and oxide nanoclusters in 14YWT oxide dispersion strengthened (ODS) alloy. Irradiation was performed using Fe++ ions with energies of 4.5 and 5.0 MeV to 100 dpa at 400°C and 500°C. The same alloy was also thermally annealed at each irradiation temperature for ~48 hours to identify purely thermal effects. Atom probe tomography (APT) studies revealed that while temperature and irradiation had negligible effect on the average nanocluster size, both factors increased Fe depletion and Cr, W, and Ti enrichment at GBs. Irradiation with 5.0 MeV ions was the only condition in which TiO, Y, and YO exhibited GB RIS and in which Cr and W reverted to depletion. This indicates that a threshold energy (i.e., damage cascade size) may be needed to chemically disorder existing nanoclusters, resulting in their GB RIS. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Temperature Materials, Nuclear Materials |