| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Spectroscopic Methods and Analysis for Nuclear Energy Related Materials
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| Presentation Title |
The Surprising Beneficial Effect of Low-Dose Proton Radiation on Suppressing the Corrosion Reactivity of Thermally Oxidized Iron |
| Author(s) |
Ho Lun Chan, Aaron Kohnert, Shivani Srivastava, Yujun Xie, Maciej Oskar Liedke, Rasheed Auguste, Elena Romanovskaia, Franziska Schmidt, Maik Butterling, Valentin Romanovski, Yongqiang Wang, Farida A Selim, Eric Hirschmann, Andreas Wagner, Blas U Uberuaga, Mark Asta, Peter Hosemann, John Scully |
| On-Site Speaker (Planned) |
Ho Lun Chan |
| Abstract Scope |
Under nuclear radiation, the protective surface oxide layer of structural alloys can be compromised. This phenomenon points to the production of non-equilibrium point defects and dislocations in the oxide by irradiation, leading to radiation enhanced migration. However, in this work, an exception was observed where iron, air oxidized at 600oC for 1 hr, demonstrates suppressed corrosion reactivity in room temperature (RT) 0.1M borate buffer solution after being subjected to 200 keV, 0.03 dpa protons at RT. The oxide layer exhibits an outer α-Fe2O3 and an inner Fe3O4/FeO layers. A multi-modal sweep of methods were leveraged to characterize the material properties at different scales: (i) TEM, EELS, XRD for microstructure and composition, (ii) PAS for vacancy concentration and size distributions; (iii) AC and DC electrochemical techniques, e.g. LSV, EIS, Mott-Schottky for the oxide kinetic and semiconductor properties analysis; (iv) cluster-dynamic modeling & DFT to formulate mechanism. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Environmental Effects, Iron and Steel |