| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials III
|
| Presentation Title |
Understanding Early Stages of Nanoscale Hydriding and Oxidation Mechanisms in Metallic Systems via Atom Probe Tomography and Multimodal Chemical Imaging |
| Author(s) |
Elizabeth Jane Kautz, Sten Lambeets, Bharat Gwalani , Daniel Perea, Daniel Schreiber, Arun Devaraj |
| On-Site Speaker (Planned) |
Elizabeth Jane Kautz |
| Abstract Scope |
Metal alloys undergo surface reactions when exposed to reactive gaseous environments (e.g. hydrogen, oxygen), which impact material performance and component lifetime. Such gas-surface reactions are extremely important to several applications, however mechanisms of hydride and oxide phase formation are still inadequately understood. Here, an environmental reactor chamber attached to an atom probe tomography system is used to study early stages of compositional changes at alloy surfaces. For select systems (Zirconium, Uranium), we study the oxide/metal interface chemistry at elevated temperature for varying times. Changes in composition after hydrogen gas loading are also investigated for Zirconium. APT results are correlated with analysis performed via STEM, XANES, and nano scratching to provide unique insight into structural and chemical state changes before/after oxidation, and adhesion of the oxide film. This multimodal approach can be used to elucidate atomic scale mechanisms of initial, adherent oxide layer formation and hydrogen absorption in industrially relevant alloys. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |