About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Ion Irradiation Effects on Surface Oxidation and Microstructure in Fe-8Cr Epitaxial Films: A Correlative TEM and APT Study |
| Author(s) |
Jijo Christudasjustus, Sandra Taylor, Kayla Yano, Minju Choi, Mark Bowden, Libor Kovarik, Sten Lambeets, Hyosim Kim, Vaithiyalingam Shutthanandan, Daniel Schreiber, Tiffany Kaspar |
| On-Site Speaker (Planned) |
Jijo Christudasjustus |
| Abstract Scope |
This study focuses on the oxidation response of a Fe-8Cr epitaxial thin film, grown via molecular beam epitaxy to eliminate grain boundary effects and precisely assess irradiation-induced phenomena. Regions of the film were irradiated with He or Fe ions at room temperature, followed by in-situ oxidation analysis using atom probe tomography with sequential exposure to 16O and 18O isotopes at 300 °C. The results revealed accelerated oxidation kinetics and altered oxide chemistry in irradiated regions, particularly after Fe ion irradiation. Enhanced Cr diffusion toward the surface was evident, indicating irradiation-induced changes in transport mechanisms. Correlative TEM imaging of the oxidized atom probe tips confirmed surface modification and the role of irradiation-induced defects in facilitating Cr migration. Microstructural analysis showed that He irradiation induced a progression from isolated dislocation loops at low fluence to dislocation networks at higher fluences, accompanied by a shift from larger to smaller He bubbles. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Characterization, Other |