About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Microstructural Dependence of Defect Formation in Iron-oxide Thin Films |
Author(s) |
Benjamin Kyle Derby, Sean Mills, Sahil Agarwal, James A. Valdez, J. Kevin Baldwin, Matthew M. Schneider, Andrew M. Minor, Blas P. Uberuaga, Farida Selim, Nan Li |
On-Site Speaker (Planned) |
Benjamin Kyle Derby |
Abstract Scope |
Passivating iron-oxide films are grown atop iron films simulating the corrosion process in a nuclear reactor environment. Two oxide films grown via physical vapor deposition at 600 °C and room temperature exhibited dense-epitactic and columnar-polycrystalline, microstructures respectively. A third oxide film grown in open air at 600 °C exhibited an equiaxed, porous morphology. Positron annihilation spectroscopy was used to characterize point defects and measure their depth and size distributions in each oxide layer and showed a range of average positron lifetimes from 0.23 ns in the high temperature, vapor deposited film, 0.35 ns in the room temperature-grown film, and 0.31 ns in the thermally grown oxide. These data indicate that the film morphology, which varies greatly in these films, leads to very different defect content. 4DSTEM was used to measure the internal stress of each film and was correlated to the strain state presented in the X-ray diffraction spectra. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Characterization, Nuclear Materials |