About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Synergistic Irradiation, Corrosion, and Microstructural Evolution in Nuclear Materials
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Presentation Title |
One-dimensional Wormhole Morphology Induced by Molten Salt Corrosion in Ni-Cr Alloy |
Author(s) |
Yang Yang, Weiyue Zhou, Sheng Yin, Sarah Wang, Qin Yu, Matthew Olszta, Daniel Schreiber, Jim Ciston, John Scully, Robert Ritchie, Mark Asta, Ju Li, Michael Short, Andrew Minor |
On-Site Speaker (Planned) |
Yang Yang |
Abstract Scope |
The progression of localized corrosion is often accompanied by the evolution of porosities in materials, creating internal mass-flow pathways which facilitate the ingression of the external environment into the interior of the material. Visualizing the morphology of these porosity networks is crucial for the understanding of how materials get penetrated by corrosion. Here, using FIB-SEM 3D reconstruction and TEM tomography techniques, we characterized the unique morphology of porosities in Ni-20Cr after corrosion in FLiNaK molten salt. We discovered that an extremely localized form of corrosion, which we call one-dimensional (1D) wormhole corrosion, is responsible for the fast penetration of salt in Ni-20Cr. Combining advanced electron microscopy and density functional theory simulation, we further deciphered the nano-structural origin of this corrosion morphology and directly imaged the vacancy-supersaturated region as the precursors of wormholes. Our discovery is an important step towards the fundamental understanding of synergistic irradiation and molten-salt corrosion in metals. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Environmental Effects, Characterization |