About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Characterization of Hydrogen and Helium at Cavities in Triple Ion Irradiated F82H-IEA With High-Resolution Electron Energy Loss Spectroscopy |
| Author(s) |
Logan Nicholas Clowers, Gary S. Was |
| On-Site Speaker (Planned) |
Logan Nicholas Clowers |
| Abstract Scope |
A series of dual and triple ion beam irradiations were conducted at the Michigan Ion Beam Laboratory on the RAFM steel F82H-IEA to understand the synergy between transmutation gases H and He on cavity nucleation and growth. Irradiation consisted of 5 MeV Fe2+ as the damaging ion co-injected with 2.85 MeV He2+ and 390 keV H+ ions through Al foil energy degraders to achieve injection levels of 40/10 appm/dpa of H/He. Systematic variation of irradiation temperature (400°C to 600°C) and damage level (50 to 150 dpa) was preformed to isolate the changes in irradiated microstructure across these conditions. From each irradiation experiment, focused ion beam (FIB) milling techniques were utilized to create cross-sectional lamella and the radiation induced cavity microstructure was characterized using transmission electron microscopy (TEM). High-resolution electron energy loss spectroscopy (EELS) elemental mapping techniques were then used to observe the core-shell structure of helium and hydrogen at small bubbles (<5 nm) and larger voids (>5 nm). Quantification of the residual signal through spectral deconvolution techniques such as Principal Component Analysis (PCA) was then done to estimate the concentration of each gas across a wide range of temperatures and damage levels. These experiments provide insight into the mechanisms behind the effect of H on He-driven cavity nucleation and growth across a wide set of conditions. |
| Proceedings Inclusion? |
Undecided |