About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Exploring Microstructural Evolution and Radiation Effects in Nanotube-Integrated Metal Composite Alloys |
| Author(s) |
Matthew J. Lynch, Mirza A. Shawon, Jason R. Trelewicz, Jingfan Yang, Xinchang Zhang , Rongjie Song, Kevin G. Field |
| On-Site Speaker (Planned) |
Matthew J. Lynch |
| Abstract Scope |
Traditional alloy design leverages fundamental phase-kinetic principles to produce sub-grain features like precipitates, carbides, and secondary phases, significantly influencing radiation resistance, but are often material-specific and not easily generalized across different material classes. This study investigates the creation of hierarchical microstructures and their radiation resistance by incorporating nanoscale materials into advanced manufacturing processes. This approach decouples sub-grain microstructural features from the bulk alloy composition, allowing independent tailoring for specific applications. We examined the integration of carbon and boron-nitride nanotubes into the powder manufacturing of advanced reactor candidate commercial alloys, specifically Inconel 718 and SS 316L. The microstructural evolution of these composite materials was evaluated through multiple ion irradiation experiments, focusing on bubble/cavity formation and irradiation-induced swelling. Dual ion irradiations were performed at 450°C with either 8/9 MeV Ni 3+ /Fe 3+ heavy ions, and foil-degraded 3.42 MeV He 2+ to simulate neutron transmutation effects. Materials were irradiated from 30 to 130 dpa, and a constant appm He per dpa ratio of 0.5 or 13. The high-dose and high-He condition was found to over nucleate small He bubbles (< 5 nm diameter) throughout the microstructure of all materials, while the
low-He condition resulted in a dose-dependent cavity size relationship with the response dependent on composition and nanoscale incorporation. This study will summarize the post-fabrication and post-irradiation stability of these nanostructures and quantify their helium sequestering capabilities. |
| Proceedings Inclusion? |
Undecided |