| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Global Self-Organization Induced by Ion Irradiation in Alloy Nanocrystalline Films |
| Author(s) |
Pascal M. Bellon, Sourav Das, Amit Verma, Yen-Ting Chang, Gabriel Bouobda Moladje, Nicholas Saunders, Marie-Agathe Charpagne, Robert S Averback |
| On-Site Speaker (Planned) |
Pascal M. Bellon |
| Abstract Scope |
Irradiated nanocrystalline alloys often display complex microstructures comprised of structural defects, e.g., grain boundaries, triple junctions, dislocation loops, and chemical heterogeneities, e.g., segregated layers and nanoprecipitates. Past experiments and modeling have shown that these distinct microstructure elements may self-organize into patterns as irradiation drives materials away from equilibrium. The coupling between structural and chemical sub-systems has however rarely been investigated. We show that this coupling can produce self-healing nanostructures self-organized at a global scale. Experimental results on Al and Ni thin film alloys subjected to heavy ion irradiation illustrate the rich behavior of these systems. STEM and atom probe tomography analysis demonstrate that these alloys reach a unique steady state, where nanoprecipitates of different finite sizes can coexist at GBs, TJs and inside the grains. Phase field modeling and kinetic Monte-Carlo simulations are employed to rationalize these evolutions and to build steady-state microstructure diagrams. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nanotechnology, Phase Transformations, Nuclear Materials |