| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Refractoriness, Thermal Expansion Behavior and Microstructure Stability at 1200°C of an Equimolar Cast CoNiFeCr Alloy and Its Versions with Addition of Titanium or of Tantalum |
| Author(s) |
Romin Chevalme, Siouare Hammi, Yasmina El Hadad, Lyna Amrouche, Lionel Aranda, Patrice Berthod |
| On-Site Speaker (Planned) |
Patrice Berthod |
| Abstract Scope |
Cast equimolar CoNiFeCr MPEAs, and versions added with Ti or Ta, can be good candidates for applications at high temperatures, notably thanks to their good resistance against hot oxidation. To explore their potential for uses at temperatures up to 1200°C, samples were prepared for three different tests, from ingots elaborated to be quaternary or to contain 2 wt.%Ti or 6 wt.%Ta, contents able to enhance creep resistance. Initially, the melting ranges of the three alloys were specified by differential thermal analysis. The obtained solidus temperatures are all close to 1300°C. This allowed choosing 1200°C for the next tests. Their thermal expansion behaviors were explored until reaching 1200°C, and their microstructure behaviors at 1200°C were observed for a 50 hours duration. A curious dimensional behavior was noticed during heating and cooling. The microstructures of the CoNiFeCr alloy and its Ti-containing alloy did not evolve significantly, in contrast with the Ta-containing version. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, High-Temperature Materials |