| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Seaborg Institutes: Emerging Topics in Actinide Sciences
|
| Presentation Title |
Thermal Stability of Aged Plutonium Alloys |
| Author(s) |
Jeremy Mitchell, Shane Mann, Sarah Hernandez, Kristen Pace, Najeb M. Abdul-Jabbar |
| On-Site Speaker (Planned) |
Najeb M. Abdul-Jabbar |
| Abstract Scope |
Plutonium (Pu) and its alloys have remarkably complex phase stability that is exemplified by the presence of five allotropes across relatively narrow temperatures ranging from ambient to melting at ~640 °C. These phase transformations are accompanied by large volume changes (and in turn density) variations that can be resolved by thermal dilatometry. In this presentation, thermal stability of a suite of Pu alloys with varying Ga contents (2-7 atomic %) and age (1 to >50 years) is examined via thermal expansion measurements. These new results will be discussed in the context of past experimental and computational work to better understand the impact of comparatively small amounts of different allotropes, especially alpha-Pu, on the thermophysical properties of Ga-stabilized delta-Pu. Furthermore, relationships between age-related defects and small-scale thermophysical perturbations are also described. |
| Proceedings Inclusion? |
Planned: |