| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Insertion of Next Generation Structural Materials
|
| Presentation Title |
An Experimental High Throughput to High Fidelity Study Towards Discovering Al-Cr Containing Corrosion-resistant Compositionally Complex Alloys |
| Author(s) |
Emily Holcombe, Debashish Sur, William H. Blades, Elaf A. Anber, Daniel L. Foley, Brian L. DeCost, Jing Liu, Jason Hattrick-Simpers, Karl Sieradzki, Howie Joress, John R. Scully, Mitra Taheri |
| On-Site Speaker (Planned) |
Emily Holcombe |
| Abstract Scope |
Compositionally complex alloys (CCAs) hold the promise of simultaneously attaining superior combinations of properties such as corrosion resistance, light-weighting, and strength. Here we present the rapid identification of light weight highly corrosion-resistant alloys based on combinations of Al and Cr in a “Cantor-like” base alloy (Al-Co-Cr-Fe-Ni). Studies of similar Al-containing alloys are in-progress. High throughput experimental screening coupled with key metallurgical and electrochemical corrosion tests identified previously unstudied off-stoichiometric alloys with excellent passivation behavior. Screening was conducted with X-Ray Diffraction (XRD) and down-selected compositions were further interrogated with Transmission Electron Microscopy (TEM). The alloy native oxide performance and its self-healing attributes were probed using rapid tests in deaerated 0.1 mol/L H2SO4. Multi-element EXAFS analyses connected more ordered type chemical short-range order in the Ni-Al 1st nn shell to poorer corrosion. This study underscores the utility of high throughput screening and the potential effects of atomic order in CCAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Thin Films and Interfaces |