About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Microstructural Evolution in Dilute Nanocrystalline Al Alloys During Ion-irradiation |
Author(s) |
Sourav Das, Sung Eun Kim, Pascal Bellon, Robert S. Averback |
On-Site Speaker (Planned) |
Sourav Das |
Abstract Scope |
Nanocrystalline alloys have long been considered for nuclear applications owing to their high density of point defect sinks. Fluxes of point defects to grain boundaries, however, can lead to segregation, phase separation, and changes in corrosion and mechanical properties. Presently, little is known about phase stability in grain boundaries during irradiation and how it couples to the phase evolution in the grain interiors. In the present study, we report on phase evolution in dilute nano-crystalline microstructural Al-Sb and Al-Sc alloys during thermal annealing and ion-irradiation. Thermal annealing leads to precipitation at the grain boundaries and loss of alloy strength, while ion-irradiation leads to precipitate dissolution and strengthening. We interpret our results in terms of grain boundary strengthening by solute doping and the competition between dissolution and precipitation during irradiation. Al-Sb is particularly interesting since irradiation results in extensive segregation of Sb to the grain boundaries and enhanced strengthening. |
Proceedings Inclusion? |
Planned: |