About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
Presentation Title |
A High, Medium to Low Throughput Study of Aqueous Passivation in FeCoNi–(Crx–Aly) Alloys across Classical Cr Threshold Concentration |
Author(s) |
Debashish Sur, William H. Blades, Emily Holcombe, Elaf Anber, Lauren N. Walters, Ben Redeman, Brian DeCost, Jean-Philippe Couzinie, Howie Joress, James M. Rondinelli, Tyler M. McQueen, Karl Sieradzki, Mitra L. Taheri, John R Scully |
On-Site Speaker (Planned) |
Debashish Sur |
Abstract Scope |
FeCoNi-CrxAly alloys with x+y < 0.25 were studied with the goal of delineating the role of Al in long term passivation performance. A combinatorial thin film library with 177 different compositions was deposited and characterized through HTp XRF and synchrotron-XRD to obtain compositions and phases present in each individual alloy. Their aqueous passivation behavior was examined using a HTp scanning droplet cell in sulfuric acid by DC and AC electrochemical methods to define the best performing alloys. Bulk alloys containing Al and near Cr threshold were prepared based on the HTp screened compositions for further medium to high fidelity testing. Cr-Cr short range order was found via Neutron scattering PDF. XPS and batch ICP-OES measurements after long term exposure defined the fate of each element in terms of its role in the passivation process. A framework for understanding long term passivation in Al-Cr alloys was developed. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Other, Other |