| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Influence of the Presence of Ti or Ta on the Oxidation Behavior at 1200°C of Cast MPEAs Derived From an Equimolar CoNiFeCr Basis |
| Author(s) |
Siouare Hammi, Yasmina El Hadad, Lyna Amrouche, Romin Chevalme, Lionel Aranda, Patrice Berthod |
| On-Site Speaker (Planned) |
Patrice Berthod |
| Abstract Scope |
Equimolar CoNiFeCr multi-principal element alloys present rather high refractoriness with solidus temperatures close to 1300°C as well as good resistance against oxidation by hot air. However, to allow them to be creep-resistant enough additions can be required, and these chemical modifications may influence either in the good direction, or in a bad way, their high temperature oxidation behavior. In this work, after having characterized the oxidation behavior of an equimolar CoNiFeCr alloy at 1200°C using a thermobalance, versions with addition of either 2wt.%Ti or 6wt.%Ta were elaborated and tested in hot oxidation for the same conditions as the former reference alloy. Results clearly evidenced the influences of Ti and of Ta on the three stages of the thermogravimetry tests: oxidation during heating, isothermal mass gain kinetic, oxide spallation during cooling. These changes in behavior were interpreted by exploiting the results of post-mortem examination of the oxidized samples. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Environmental Effects |