| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments III
|
| Presentation Title |
Characterization of Simultaneous High-energy Proton and Spallation-Neutron Radiation Effects in Structural Alloys |
| Author(s) |
Timothy G. Lach, Maxim N Gussev, David A. McClintock |
| On-Site Speaker (Planned) |
Timothy G. Lach |
| Abstract Scope |
Simultaneous high-energy proton and spallation-neutron irradiation induce microstructural and mechanical responses in structural materials that are unique from irradiation only by fission neutrons or ion-beams. In addition to recoil damage at moderate temperatures (100-200 °C), transmutation reactions produce large levels of retained helium and hydrogen. The target and proton beam window (PBW) at the Spallation Neutron Source at Oak Ridge National Laboratory are irradiated in these unique environments during operation. Neutron production is dependent on the proper operation of the target and PBW; therefore, accurate understanding of the radiation-induced changes to the microstructure and mechanical properties are essential for ensuring reliable operation. Samples from 316L stainless steel targets and an alloy 718 PBW were analyzed using several complementary advanced characterization techniques, including tensile testing with digital image correlation, analytical in-situ/ex-situ electron microscopy, and thermal desorption spectrometry. Intriguing behaviors like radiation-induced ductility, strain localization, and bubble/void formation will be discussed. |