| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
High Temperature Oxidation of CoNiFeMnCr High Entropy Alloys Reinforced by MC-carbides |
| Author(s) |
Patrice Berthod |
| On-Site Speaker (Planned) |
Patrice Berthod |
| Abstract Scope |
CoNiFeMnCr alloys are possibly alternative solutions to cast cobalt or nickel superalloys able for service at 1000°C and beyond. The partial substitution of Co and Ni by Fe and Mn allow lower dependence on the Co and Ni critical elements.
In this work, equimolar CoNiFeMnCr alloys without or with added carbon and tantalum or hafnium were elaborated by high frequency induction melting under inert atmosphere. Script-like eutectic TaC or HfC were obtained in the grain boundaries of the concerned alloys, forming a strengthening carbides network. Oxidation tests were carried out in air at 1000°C and at 1100°C for 50h hours. The oxide scale externally formed is made of (Cr,Mn)2O3. Internal oxidation led to CrTaO4 or HfO2 oxides. Numerous deep oxidation penetrations were noted for the CoNiFeMnCr alloy while the MC-containing alloys were not affected by this phenomenon, evidencing a possible beneficial influence of the presence of the carbides on oxidation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Environmental Effects |