| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization and Modeling of Nuclear Fuels: Microstructure, Thermo-physical Properties
|
| Presentation Title |
Micromechanical Behavior of Thermally Loaded Monoclinic U-6Nb |
| Author(s) |
Daniel Savage, Bjorn Clausen, Travis Carter, Joshua White, Sven Vogel, Donald Brown |
| On-Site Speaker (Planned) |
Daniel Savage |
| Abstract Scope |
Uranium alloyed with Nb enhances corrosion resistance and for 6 wt% Nb when cooled rapidly from austenite to martensite, a substantial ductility increase is observed compared to unalloyed U. The martensitic microstructure de-twins upon mechanical loading following variant selection rules and proceeds with a number of twin and slip modes which allow microstructure design by manipulating deformation paths. The martensite also exhibits massive, anisotropic thermal strains up to 2.5% and bulk expansion or contraction can be tailored through texture manipulation. During thermal loading, large intergranular stresses should exist due to large expansion or contraction of neighboring grains; however, the role of these stresses on property evolution is not understood. To reveal the coupling between microstructure and thermal behavior, insitu neutron diffraction of differently textured samples cycled from 4K to 473K will be presented. To help interpret insitu data, polycrystalline self-consistent modeling will be employed to isolate thermal and elasto-plastic contributions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Modeling and Simulation |