About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
4D-STEM/EDS Characterization of Molten Salt Corrosion in NiCr Alloy |
Author(s) |
Sean H. Mills, Ryan Hayes, Steven Zeltmann, Raluca Scarlat, Andrew Minor |
On-Site Speaker (Planned) |
Sean H. Mills |
Abstract Scope |
Structural metals used in nuclear reactor environments are exposed to coupled extremes such as irradiation, high temperature, and corrosion which act synergistically to degrade material performance. These processes are directly limited or accelerated by nanoscale point defects such as vacancies, interstitials, and voids. Quantifiable methods of elucidating formation of point defects and their role in diffusion kinetics and material failure, have been limited to bulk or ex-situ measurements. Development of 4D-STEM via high-speed direct electron detectors provides opportunities to map distributions of nanoscale features. Here, we examine the exposure of NiCr alloy to LiF-NaF-KF eutectic salts (FLiNaK) by measuring point defects (with 4D-STEM) and Cr migration (with EDS-STEM) at the metal-salt interface. Measurements of corrosion defects at high spatial resolution advances our understanding of complex corrosion environments, thereby providing a pathway for engineering materials designed in future nuclear energy systems. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Nuclear Materials, |