| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Competition Between Radiation-Induced Segregation and Grain Growth in Dilute Nanocrystalline Ni-Zr |
| Author(s) |
Yen Ting Chang, Pascal Bellon, Robert Averback, Marie Charpagne |
| On-Site Speaker (Planned) |
Yen Ting Chang |
| Abstract Scope |
Owing to their dense grain boundary network that acts as a potent defect sink, nanocrystalline alloys are promising candidates for use under irradiation. However, their thermal stability has remained a lasting challenge amid a strong driving force for grain growth under thermal and radiation exposure, which decreases the alloys strength and promotes swelling.
Here, we investigate the competition between radiation-induced segregation (RIS) and radiation-induced grain growth in dilute Ni-Zr alloy thin films grown by sputter deposition and irradiated with Ti ions at 450C to doses over 100 dpa. Starting from a solid solution, we show that this system develops a secondary phase onto its grain boundaries via RIS, therefore dynamically preventing grain growth.
Using correlative mapping techniques in electron microscopy, TEM EDS and 4D STEM, we combine crystallographic and composition measurements to shed light on the mechanisms responsible for grain boundary pinning and the effect of the grain boundary character. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Copper / Nickel / Cobalt |