| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Radiation Effects on Diffusion and Defect Evolution at the Ni/Cr Interface Using 4D-STEM and STEM-EDS |
| Author(s) |
Dongye Liu, Sean Mills, Benjamin Derby , Matthew Chancey, Yongqiang Wang, Andrew Minor |
| On-Site Speaker (Planned) |
Dongye Liu |
| Abstract Scope |
Nuclear reactor components are exposed to concurrent extremes such as irradiation, high temperature, and corrosion making them susceptible to degradation. Specifically, heterogeneous interfaces and phase boundaries are known sources for point defect accumulation, however precise observation and quantification of these nanoscale defects remains challenging. Here we study radiation-enhanced diffusion (RED) and defect evolution by utilizing an interdiffusion couple of Ni/Cr under both thermal and ion radiation conditions. Moreover, we use four-dimensional scanning transmission electron microscopy (4D-STEM) strain mapping technique and energy dispersive spectroscopy (STEM-EDS) to measure local changes in chemistry and structure at the bimetal interface. With these combined approaches, we quantify and spatially map irradiation-induced point defects to determine their influence on thermally activated microstructural heterogeneities such as dislocations and voids under different thermal cycling conditions. This improves our fundamental understanding of defects and their role in the behavior of metal components exposed to extreme nuclear reactor environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Thin Films and Interfaces |