| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
2024 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-78: Structure Evolution and Sn Redistribution Accompanying Zircaloy-4 Oxidation |
| Author(s) |
Josephine Caroline Hartmann, Tamas Varga, Vaithiyalingam Shutthanandan, Bharat Gwalani, Arun Devaraj, David Senor, Elizabeth Kautz |
| On-Site Speaker (Planned) |
Josephine Caroline Hartmann |
| Abstract Scope |
When Zircaloy-4 is exposed to an oxidative environment, a zirconium oxide layer with varying microstructure, composition, and crystal structure forms. Alloying elements (e.g., Sn) and second phase precipitates are incorporated into the oxide layer, impacting oxidation behavior. This work focuses on oxide structure evolution, associated chemical state changes, and Sn incorporation in the oxide layer. In-situ XRD during Zircaloy-4 oxidation under oxygen gas at 500°C was coupled with ex-situ XPS, STEM, and APT to characterize phase evolution, speciation, composition, and microstructure in the oxide layer. Oxide structure evolution is defined by the formation of cubic ZrO followed by tetragonal ZrO2 and monoclinic ZrO2. This layered oxide was confirmed via TEM analysis. In the outer ~ 70-nm layer of the oxide, Zr+2 and Zr+3 are found in addition to Zr+4. During oxidation Sn redistributes to a larger cluster size and higher concentration away from the oxide/metal interface. |
| Proceedings Inclusion? |
Undecided |