|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||In Situ Atom Probe Tomography of Oxidation Mechanism in High Entropy Alloys
||Bharat Gwalani, Elizabeth J. Kautz, Sten v. Lambeets, Libor Kovarik, Arun Devaraj
|On-Site Speaker (Planned)
High Entropy Alloys (HEAs) have shown promise for use in high temperature applications in which they are exposed to reactive environments containing oxygen gas (O2). Oxidation reactions directly modify the surface composition-structure, affecting material and component performance. However, due to the complexity of HEA composition, atomistic mechanisms responsible for surface modification are inadequately understood. Here, we demonstrate the gas-induced change in structure of near-surface regions using in situ gas reaction-cell in transmission electron microscope. Furthermore, we demonstrate the changes to the composition of surface and sub-surface regions of the same alloy and exposure conditions in an environmental reaction chamber attached with an atom probe tomography system. The approach presented here can aid in obtaining a detailed understanding the sequential oxidation of in HEAs which can be broadly applicable to a wide variety of complex alloy systems containing multiple alloy elements.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume