| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Creep Properties of Advanced Structural Materials
|
| Presentation Title |
F-3: Strengthening Against Creep at Elevated Temperature of HEA Alloys of the CoNiFeMnCr Type Using MC-carbides |
| Author(s) |
Patrice Berthod |
| On-Site Speaker (Planned) |
Patrice Berthod |
| Abstract Scope |
Cast high entropy CoNiFeMnCr alloys can become alternative solutions to cast cobalt-based and nickel-based superalloys able to resist creep at 1000°C and beyond. The partial substitution of Co and Ni by Fe and Mn allow lower cost and lower dependence on the Co and Ni critical elements. However, their grain boundaries need to be strengthened.
In this work equimolar CoNiFeMnCr alloys were elaborated by high frequency induction melting under inert atmosphere, after having added carbon and either Ta or Hf, in quantities rated to favor the development of an intergranular network of script-like eutectic carbides, either TaC or HfC. These carbides were successfully obtained with the required location and morphology. 3 points bending creep tests were carried out at 1100°C for an induced maximal tensile stress equal to 20 MPa. Interesting resistance was noted for some of these alloys, taking into account the high levels of applied stress and temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |