| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Composite Materials for Nuclear Applications
|
| Presentation Title |
Competition between Void Evolution and Amorphization In Radiation-tolerant Nanocrystalline Cu-10at%Ta Alloy |
| Author(s) |
Priyam Patki, Wei-Ying Chen, Janelle P Wharry |
| On-Site Speaker (Planned) |
Priyam Patki |
| Abstract Scope |
The objective of this study is to understand the role of cascade morphology on the ion irradiation evolution of nanostructured Cu-10at%Ta alloy. The alloy is immiscible and has nanocrystalline Cu grains with a bimodal distribution of Ta nanoparticles. In this study, TEM in situ irradiation is conducted on Cu-10at%Ta lamellae using Ne, Kr, and Xe ions at temperatures ranging 100-400℃ to doses up to 10 displacements per atom (dpa). Irradiation-induced voids are observed at higher temperatures. Void onset dose decreases with cascade size, but void number density increases for smaller cascades. Irradiation-induced core-shell amorphization of Ta particles occurs at lower temperatures and with larger cascades. Amorphization and void formation compete at moderate temperatures. The point defect balance equations can explain these results by ascribing voids to the vacancy flux, and amorphization to the interstitial flux. This work provides insight into irradiation disordering of nanoparticles in oxide dispersion strengthened (ODS) alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Nanotechnology, Characterization |