| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Materials through High Resolution Coherent Imaging
|
| Presentation Title |
The Application of Advanced Coherent Imaging Technique and Element Analysis on a Self-organized Loop Structure |
| Author(s) |
Yao Li, Arunodaya Bhattacharya, Yajie Zhao, Jean Henry, Steven Zinkle |
| On-Site Speaker (Planned) |
Yao Li |
| Abstract Scope |
After self-ion irradiation at 450 °C, a complex loop structure was observed in BCC Fe-Cr alloys. At low damage (0.35 displacements per atom, dpa), large <001>{200} petal-shaped interstitial dislocation loops were created. For a given branch of a petal-shaped loop, it might have smaller and self-similar branches. Using atomic-resolution STEM-HAADF imaging techniques, we revealed that each petal-shaped loop is a 3-D structure consisting of multiple small <001> sections on different atomic planes with the same plane normal. STEM-EDS imaging under two equivalent two-beam approximations showed distinct Cr segregation on the same petal-shaped loop. To confirm the Cr segregation, atomic-resolution STEM-EDS and APT were applied. The strain field by the complex structure as determined by 4-D STEM techniques will be summarized. At the high damage (3.5dpa), 2-D dislocation loop walls were observed. The formation of 2-D loop walls might be due to the decomposition of petal-shaped loops. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Iron and Steel |