| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Advanced Nanometer Resolution In-situ Strain Mapping for Metal Oxidation by 4D-STEM |
| Author(s) |
Ying Han, Yongwen Sun, Dan Zhou, Hugo Perez Garza, Alejandro Gomez Perez, Thanos Galanis, Starvos Nicolopoulos, Yang Yang |
| On-Site Speaker (Planned) |
Yongwen Sun |
| Abstract Scope |
Oxidation is a significant concern in metal material applications, leading to surface degradation, corrosion, and reduced mechanical properties. To understand the resulting strain anisotropy and advance oxidation mechanism theory, accurate strain mapping is crucial. We focus on Zr as an example due to its relevance in architecture materials for fuel cladding. Our in-situ strain mapping method integrates advanced techniques including 4D scanning transmission electron microscopy (4D-STEM), gas-cell-holder, precession electron microscopy, and direct electron detector, ensuring a high signal-to-noise ratio in nano-beam electron diffraction patterns for accurate strain mapping. We will discuss the oxidation mechanism of Zr and the effects of gas pressure, sample thickness, and electron beam precession to oxidation. This approach enables high-quality, nanometer-resolution strain mapping during Zr oxidation across a large field of view. It holds implications for corrosion studies, offering insights into materials' chemo-mechanical evolutions under extreme conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, |