| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Seaborg Institutes: Emerging Topics in Actinide Materials and Science
|
| Presentation Title |
Recovery in Stabilized Delta Pu and Its Effects on Thermal Expansion |
| Author(s) |
Najeb M. Abdul-Jabbar, Shane C Mann, Jeremy N Mitchell |
| On-Site Speaker (Planned) |
Najeb M. Abdul-Jabbar |
| Abstract Scope |
The kinetics and thermodynamics that drive the delta Pu stabilization mechanism via tri-valent cations are still not fully understood. Renewed efforts at Los Alamos National Laboratory (LANL) have focused on probing recovery effects of aged and pre-conditioned delta alloys at temperatures in the vicinity of eutectoid decomposition in the Pu-Ga phase diagram. In both scenarios, noticeable thermal contraction is observed (via dilatometry) across temperatures ranging from 125-225 °C. Analogous behavior in Pu has been observed via electrical resistivity measurements, which has been attributed to migration of point defects, dislocations, and vacancy clusters. Whether interactions between defects produced by pre-conditioning or natural aging can develop into alpha-like embryos that facilitate eutectoid decomposition remains to be seen. Consequently, ongoing thermal analysis work is being conducted at LANL on a comprehensive series of pre-conditioned and naturally aged Pu-Ga alloys and the ensuing results in the context of delta phase stability will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, |