| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Investigating the Synergistic Effects of Al on Aqueous Passivation of Cr Containing [FeCoNi]-CrxAly Compositionally Complex Alloys (CCAs) |
| Author(s) |
Debashish Sur, William H. Blades, Ben Redemann, Nathan Smith, Emily F. Holcombe, Mitra L. Taheri, Chris Wolverton, Tyrel McQueen, Karl Sieradzki, John R. Scully |
| On-Site Speaker (Planned) |
Debashish Sur |
| Abstract Scope |
FeCoNi-Crx-Aly CCA thin films with x+y < 0.25 were studied to delineate the role of Al on long-term passivation performance. A combinatorial thin film library with 177 different compositions was deposited and characterized through high throughput x-ray fluorescence and synchrotron x-ray diffraction to obtain compositions and microstructures. Their aqueous passivation behavior was examined using a scanning droplet cell in sulfuric acid by DC and AC electrochemical methods to define the best-performing alloys. Bulk FeCoNi-Crx-Aly CCAs with Al and Cr ranging from 0-16 at% and 0-13 at%, respectively, were prepared based on the high-throughput screened single phase compositions for further medium-to-high fidelity testing. CCAs containing 10 at.% Cr fixed below the stainless steel threshold of 12 at.% achieved excellent passivation by formation of a Cr(III) rich film when alloyed with small amounts of Al. Evidence of an Al-Cr synergy was uncovered in both chloride free and chloride containing acidified environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Environmental Effects, Sustainability |