About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Vacancy Engineering in Metals and Alloys
|
| Presentation Title |
Dynamic microstructure stabilization via self-organization on grain boundaries in dilute nanocrystalline alloys |
| Author(s) |
Marie Charpagne, Robert Averback, Pascal Bellon, Sourav Das, Yen-Ting Chang |
| On-Site Speaker (Planned) |
Marie Charpagne |
| Abstract Scope |
Structural nuclear materials are exposed to sustained irradiation by energetic particles, which typically leads to microstructure instabilities and the deterioration of mechanical properties during service. Here, we reveal the formation of unique second-phases on grain boundaries, in dilute nanocrystalline Cu-Zr and Ni-Zr alloys subject to ion irradiation. The formation of these radiation-induced “defect phases” leads to stabilization via self-organization on the scale of the entire microstructure, which thereby limits coarsening. These observations indicate that the type (misorientation angle, special boundaries), density (e.g. spacing), and connectivity of the grain boundaries directly affect the formation of steady-states under irradiation. Results will be rationalized in terms of the balance between ballistic mixing and radiation-induced segregation, solute concentration, and solute-point-defect binding energies; to frame the concept of dynamic grain boundary phase formation during irradiation as a vector to radiation-tolerance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, |