| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Enhancement of Chromium-Based Bcc-Superalloys for High-Temperature Applications |
| Author(s) |
Kan Ma, Thomas Blackburn, Anke Silvia Ulrich, Michael Kerbstadt, Tatu Pinomaa, Mathias Galetz, Uwe Glatzel, Alexander Knowles |
| On-Site Speaker (Planned) |
Kan Ma |
| Abstract Scope |
Analogous to FCC nickel-based superalloys' gamma/gamma-prime structure, BCC-superalloys are an emerging class of materials featuring a body-centred (bcc) cubic A2 matrix (e.g., refractory metals) reinforced by ordered-bcc superlattice precipitates (e.g., B2-NiAl). In this work, chromium-based bcc-superalloys, Cr(Fe)-NiAl, have been designed based on phase diagram calculations (CALPHAD), exhibiting advantageous microstructure stability compared to ferritic and nickel-based superalloys and high compressive yield strength over 1000 °C. The oxidation behaviour of Cr(Fe)-NiAl is investigated using isothermal oxidation up to 1200 °C combined with thermogravimetric analysis. Furthermore, a quinary element is selected and alloyed to improve these alloys’ environmental and mechanical behaviour. The effect of the quinary element on the microstructure is experimentally revealed using diffusion couples, and the current CALPHAD databases are evaluated. Onward indentation, oxidation and creep experiments will be performed to optimise the alloy compositions regarding their oxidation resistance and creep strength. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Characterization, Mechanical Properties |