| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Instability of Single-Phase Nanocrystalline Materials Versus Stability of Dual-Phase Nanocomposites Under Ion Irradiation at Elevated Temperatures |
| Author(s) |
Kelvin Yu Xuan Xie, Digvijay Yadav, Kenneth Cooper, Benjamin Derby, Yongqiang Wang, Jon Kevin Baldwin, Yaqiao Wu, Jiaqi Dong, JungHun Park, Sunkyung Lee, Gi-Dong Sim, Lin Shao, Michael Demkowicz |
| On-Site Speaker (Planned) |
Kelvin Yu Xuan Xie |
| Abstract Scope |
Materials used in nuclear applications undergo irradiation damage at elevated temperatures. The high-temperature irradiation responses of nanocrystalline materials and nanocomposites are interesting because these materials possess a high volume density of interfaces, such as grain and phase boundaries, which can serve as efficient defect sinks. In this work, we examine the microstructural evolution of irradiated-nanocrystalline Ni synthesized via physical vapor deposition. The sample annealed at 400°C for 84 hours exhibited only marginal grain growth. However, significant coarsening occurred under identical conditions with 1 MeV proton irradiation. In contrast, the Cu-Mo nanocomposite microstructure showed resilience to 20 keV helium implantation, with no significant changes across temperatures ranging from 25 to 750°C when comparing the irradiated to the unirradiated regions. Our findings reveal that single-phase nanocrystalline materials are prone to coarsening from radiation-induced vacancy diffusion. Conversely, the phase boundaries in nanocomposites effectively hinder diffusion and suppress microstructural coarsening. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Composites, Characterization |