| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Correlative STEM-APT Analysis of Solute-Defect Interaction |
| Author(s) |
Siwei Chen, Jonathan D. Poplawsky, Steven J. Zinkle |
| On-Site Speaker (Planned) |
Siwei Chen |
| Abstract Scope |
Solute segregation near crystal defects (e.g., dislocation loops) is expected to reduce the mobility and increase the dislocation barrier strength of the defect. Advanced characterization of the interaction between solute and defects requires spatially-precise chemical and structural information. The optimal approach is to perform scanning transmission electron microscopy (STEM) and atom probe tomography (APT) correlatively to harness the complementary strengths of these two tools. In this study, ultra-high purity Fe-3Cr and Fe-10Cr alloys were irradiated by 8 MeV Fe ions with 1× 10-4dpa/s dose rate up to 0.35 dpa in mid-range (1μm) depths at 300 and 500 °C. Two correlative methods of lifting the APT needles from bulk samples or TEM lamellae were conducted. Cr segregation around dislocation loops with a<001> Burgers vector at 500°C were analyzed by the STEM-EDS (energy dispersive X-ray spectroscopy) and APT correlatively. While no obvious Cr segregation around dislocation loops is detected at 300 °C. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Nuclear Materials, Characterization |