| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Composite Materials for Nuclear Applications
|
| Presentation Title |
Radiation Tolerance and Microstructural Changes of Nanocrystalline Cu-Ta Alloy to High Dose Self-ion Irradiation |
| Author(s) |
Soundarya Srinivasan, Chaitanya Kale, Billy C Hornbuckle, Kris A Darling, Matthew R Chancey, Efrain Hernández-Rivera, Yimeng Chen, Thomas R Koenig, Yongqiang Wang, Gregory B Thompson, Kiran N Solanki |
| On-Site Speaker (Planned) |
Soundarya Srinivasan |
| Abstract Scope |
Radiation response of nanocrystalline Cu-Ta alloy is studied by irradiating with 4 MeV copper ions to doses of 1 dpa at 298 K; 10 dpa at 298, 573 and 723 K; 100 and 200 dpa at 298 and 573 K. Nanoindentation results for samples irradiated till 100 dpa at 298 and 573 K show exceptionally low hardening compared to candidate materials from literature. Microstructural characterization using TEM and APT, shows a stable nanocrystalline microstructure with minimal grain growth and a meagre swelling in samples irradiated to 100 dpa (~0.2%) and 200 dpa at RT, while no voids in those at 573 K. This radiation tolerance is partly attributed to the stability of Ta nanoclusters due to phase separating nature of the alloy. Additionally, the larger tantalum particles are observed to ballistically dissolve at >100 dpa and eventually precipitate as nanoclusters, replenishing the sink strength, which enhanced the material’s radiation tolerance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Composites, Other |