About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Environmental Degradation of Multiple Principal Component Materials
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Presentation Title |
Determining Elemental Distributions across Thin Corrosion Films on Multi-principal Element Alloys via Atom Probe Tomography |
Author(s) |
Elizabeth Jane Kautz, Angela Y. Gerard, Sten V. Lambeets, Daniel E. Perea, John R. Scully, Daniel Schreiber |
On-Site Speaker (Planned) |
Elizabeth Jane Kautz |
Abstract Scope |
Atom probe tomography (APT) provides a unique, three-dimensional map of elemental distributions formed during oxidation and corrosion of multi-principal element alloys (MPEAs) with near-atomic resolution. While ex situ APT characterization is well-established for analyzing buried interfaces in materials, the similar analysis of nanoscale surface films formed during alloy passivation is extremely challenging. In this talk, we discuss sample preparation and general experimental approaches to leverage APT’s 3D imaging capabilities for analyzing thin passive films. Ex-situ sample capping strategies and quasi-in-situ APT experiments with passive films formed directly on APT needles will be contrasted. Observations of elemental segregation, partitioning, and kinetic trapping are discussed in the context of initial passive film formation on corrosion resistant non-equiatomic transition metal-based MPEAs and model binary alloys. Lastly we highlight ongoing challenges and opportunities for this experimental approach. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Environmental Effects, High-Entropy Alloys |