| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Environmental Degradation of Multiple Principal Component Materials
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| Presentation Title |
Oxidation Mechanisms and Kinetics of As-Cast Versus Homogenized Refractory-Based High Entropy Alloys |
| Author(s) |
Kavin Ram, Jibril Shittu, Connor James Rietema, Joseph T Mckeown, Peter Hosemann |
| On-Site Speaker (Planned) |
Kavin Ram |
| Abstract Scope |
Refractory High-Entropy Alloys (RHEAs) show great promise for applications that require high temperature strength; however, the oxidation performance of these alloys is critical in extreme aerospace environments, where temperatures that approach 1000°C exacerbate oxidation reactions. An alloy design framework predicted CrMoNbV to be a promising candidate for high-temperature strength. Furthermore, the equiatomic CrMoNbV composition has favorable BCC phase stability at high temperatures, but its oxidation characteristics are unknown. The as-cast sample showed increased oxidation with selective dendrite attack and a two-region diffusion-controlled process, while the annealed sample exhibited reduced oxidation, homogeneous oxide growth, and no selective surface oxide development. Here, results will be presented using a suite of characterization techniques, including TGA, EDS, and SEM imaging, to investigate the underlying characteristics driving the oxidation kinetics and mechanisms for as-cast and homogenized compositions. Prepared by LLNL under Contract DE-AC52-07NA27344.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Environmental Effects |