| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Steady-state Microstructures in Nanocrystalline Al-Sb Alloy under Irradiation |
| Author(s) |
Sourav Das, Amit Verma, Pascal Bellon, Robert S. Averback |
| On-Site Speaker (Planned) |
Sourav Das |
| Abstract Scope |
Prolonged irradiation of alloys with energetic particles leads to sustained fluxes of point defects to sinks, often with concomitant radiation induced segregation (RIS) and precipitation (RIP). In the present study, we use atom probe tomography and electron microscopy (HAADF-STEM/STEM-EDS) techniques to characterize novel microstructures that develop in nanocrystalline Al-1.5at% Sb alloy during 2 MeV Ti+ irradiation at elevated temperature. Al-Sb alloy is well suited to study RIS/RIP due to strong solute-vacancy binding (ESb-Vb~0.39 eV) leading to significant solute drag fluxes to grain boundary sinks. We find that after a dose of 10 dpa at 75°C, a self-organized steady-state microstructure evolves containing ~10 nm Al50Sb50 precipitates at grain boundaries (GB’s), and smaller precipitates, ~5-6 nm, within the larger grains (>70 nm) and nearly complete absence of precipitates and Sb solute in smaller grains. The results are rationalized by the competition between RIS, radiation-enhanced diffusion, GB diffusion and ballistic mixing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |