About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Cutting-Edge Characterization and Electrochemical Techniques for Unraveling Corrosion Phenomena
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| Presentation Title |
Mapping the heterogeneous charge transport during oxidation of metals containing nanoscale metal inclusions with 4DSTEM and APT |
| Author(s) |
Kieran Rivers, Junliang Liu, Alexander Kvit, Ximeng Wang, Ricardo Vidrio, Andrew Tong, Jennifer Choy, Yongfeng Zhang, Adrien Couet |
| On-Site Speaker (Planned) |
Kieran Rivers |
| Abstract Scope |
Current corrosion models only account for one-dimensional homogeneous oxidation and charge transport. However, as seen in many high-temperature alloy systems, oxide/metal interfaces typically grow heterogeneously. Prior DFT and 4DSTEM simulations show there is a space charge developing across planar metal/oxide interfaces which is dependent on system properties. In complex alloys, nanoscale metallic inclusions commonly form within thermally grown oxides and are hypothesized to locally affect the charge transport via space charge effects, contributing to inhomogeneous oxide growth. The mechanisms underlying this influence remain poorly understood, and lack experimental validation. In this work, we demonstrate the use of 4DSTEM to visualise the charge distribution across interfaces, and map the resulting heterogeneous charge flux induced by nanoscale metal inclusions. Results are correlated with APT using tracer diffusion of 18O to probe mass transport pathways. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Environmental Effects, Other |