| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Stability of Hydrogen/Helium-filled Nanocavities in Structural Alloys after Low Temperature Irradiation with Simultaneous High Energy Protons and Spallation Neutron |
| Author(s) |
Timothy G. Lach, Maxim N Gussev, Kinga A Unocic, Amy Godfrey, Weicheng Zhong, David A McClintock |
| On-Site Speaker (Planned) |
Timothy G. Lach |
| Abstract Scope |
Simultaneous high-energy proton and spallation neutron irradiation induce behaviors in structural materials that are unique from fission neutrons or ion beams. In addition to recoil damage at moderate temperatures (~100°C), transmutation reactions produce large levels of helium and hydrogen. The target module (TM) and proton beam window (PBW) at the Spallation Neutron Source (SNS) at ORNL are irradiated in these unique environments during operation. To extend SNS component lifetimes, accurate understanding of the radiation-induced changes to the microstructure and properties is essential, with particular focus here on the transmutation gas/matrix interactions. TM 316L stainless steel and alloy 718 PBW materials were characterized using analytical electron microscopy, differential scanning calorimetry, and thermal desorption spectrometry to investigate the interaction of transmutation gases and stored energy in the matrix after irradiation and annealing. The in-operando stabilization of nanoscale gas-filled cavities and its effects on radiation-enhanced ductility and strain localization will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, |