| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Influence of Irradiation Damage on the Mechanical Properties and Stability of Grain Boundaries in Ultrafine-Grained Gold Thin Films |
| Author(s) |
Josh Kacher |
| On-Site Speaker (Planned) |
Josh Kacher |
| Abstract Scope |
Ultrafine grained (UFG) Au thin films deform via transgranular dislocation glide and disconnection-mediated grain boundary migration. The influence of irradiation defects on transgranular flow is well-understood, with defects acting as pinning sites during dislocation glide. The influence of irradiation defects on grain boundary migration, however, remains largely unexplored. In this study, we combine nanomechanical testing with in situ transmission electron microscopy (TEM) observations to investigate the influence of varying levels of self-ion irradiation damage on grain boundary migration. The results show that increasing levels of irradiation damage correlate with higher barriers to grain boundary migration and slower grain boundary migration rates. Regions where grain boundary migration has occurred are cleared of irradiation-induced defects, providing an avenue for statistical characterization of the influence of local microstructure conditions on grain boundary stability. Once cleared of defects, dislocations glide unimpeded through grain interiors, suggesting potential self-healing capabilities of UFG materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, Nuclear Materials |