| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
H-43: Exploring Stability of Nanocrystalline Metals with Competing Solute Effects under High Temperature Irradiation |
| Author(s) |
Christopher M. Barr, Patrick M. Price, Nathan Heckman, Brad L. Boyce, Khalid Hattar |
| On-Site Speaker (Planned) |
Christopher M. Barr |
| Abstract Scope |
Nanocrystalline metals have shown significant radiation tolerance for potential application in next generation nuclear energy systems. However, a major shortfall is low homologous temperature grain coarsening. To mitigate grain growth, researchers have developed thermodynamic and kinetic stabilization routes to stabilize the grain size through solute additions. While this has been successful in minimizing grain growth under thermal conditions, it is still unknown how these stabilization mechanisms evolve under irradiation. In this study, we explore the combined effect of both thermal exposure and irradiation in nanocrystalline Pt and a Pt-Au alloy. Under high temperature thermal conditions, grain boundary Au enrichment is shown to stabilize the grain size. In contrast, under high temperature heavy ion irradiation, significant grain growth was observed associated with de-mixing of Au solutes at grain boundaries. The competing thermal and irradiation effects in Pt-Au highlight the careful consideration needed for designing nanocrystalline alloys for combined extreme environments. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |