| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Seaborg Institutes: Emerging Topics in Actinide Sciences
|
| Presentation Title |
Full Field Modeling and Experimental Validation of Thermal Strain Accommodation in Two Phase α+δ Plutonium |
| Author(s) |
Daniel Savage, Quinton Geller, Bjorn Clausen, Travis Carver, Peter Kenesei, Jun Sang Park, Donald Brown |
| On-Site Speaker (Planned) |
Daniel Savage |
| Abstract Scope |
Temperature changes in as-cast plutonium will result in heterogenous strain distributions in the microstructure that arise from the differences in the thermal expansion behavior of the phases; the thermal expansion of α is roughly three times that of δ. Due to the complex, interleaved phase morphology in α+δ Pu, it is not known what micro-mechanical models appropriately describe the thermal strain accommodation and the magnitude of thermal stresses. To this end, absorption contrast tomography and in-situ X-ray scattering during heating and cooling between 10K and 675K was performed at the Advanced Photon Source. A tomography reconstruction is used to instantiate a realistic, fullfield model. In addition, several lower order micromechanical models are developed and the microstructure response of α+δ and the α+δ to α+β transformation are investigated. The models are benchmarked against the lattice parameters collected during in-situ diffraction, revealing the importance of model choice and the thermal phase interactions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Characterization, Phase Transformations |