|About this Abstract
||MS&T23: Materials Science & Technology
||Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments IV
||Mapping Elemental Distributions Across Thin Corrosion Films Formed on Nuclear Reactor Core and Structural Materials via Ex-situ And In-situ Atom Probe Tomography
||Elizabeth J. Kautz, Angela Gerard, Kayla Yano, Sandra Taylor, Sten Lambeets, Daniel Perea, Arun Devaraj, John Scully, Daniel Schreiber
|On-Site Speaker (Planned)
||Elizabeth J. Kautz
Atom probe tomography (APT) provides a unique, 3D map of elemental distributions with near-atomic scale resolution that can enable improved understanding of material response in extreme environments. In particular, oxidation and corrosion of alloys for nuclear applications is of current interest to support next generation reactor design. While ex-situ APT characterization is well-established for analyzing buried interfaces, the similar analysis of nanoscale surface films formed during alloy passivation is extremely challenging. Experimental approaches to leverage APT’s imaging capabilities for analyzing thin passive films, and improving our understanding of material response in harsh environments will be discussed. Ex-situ sample capping strategies and quasi-in-situ APT experiments with passive films formed directly on needles will be contrasted. Observations of elemental segregation, partitioning, and kinetic trapping are discussed in the context of initial passive film formation on alloys for core and structural components. Lastly, we highlight ongoing challenges and opportunities for this experimental approach.