About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Nanostructured Materials in Extreme Environments
|
Presentation Title |
STEM-based Mapping of Point Defects Produced via He-ion Irradiation |
Author(s) |
Sean H. Mills, Alex Lin, Alexander Pattison, Peter Ercius, Andrew Minor |
On-Site Speaker (Planned) |
Sean H. Mills |
Abstract Scope |
Structural metals used in nuclear reactor environments are exposed to coupled extremes such as irradiation, high temperature, and corrosion which act synergistically to degrade material performance. These processes are directly limited or accelerated by nanoscale point defects such as vacancies, interstitials, voids, and gas-filled bubbles. Elucidating the formation of irradiation point defects, or “black spot” damage, has been limited to bulk measurements or narrow fields of view (FOV) via conventional TEM. Here, we use 4D-STEM with ultrafast 4D Camera to efficiently map 1–5nm He-ion irradiation defects (~1nm resolution) over large (~1µm) FOV. Furthermore, the strain associated with point defects approaches the resolution limit of 4D-STEM, so complimentary high-throughput HR-HAADF-STEM (~30pm resolution, ~10nm FOV) images are collected autonomously, expanding atomic resolution displacement/strain maps to unprecedented (100nm–1µm) FOV. This multimodal approach to spatially resolving the magnitudes, morphologies and distributions of localized strain fundamentally improves how nanoscale irradiation damage is characterized. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Other, Nuclear Materials |