| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
Tuning Scale Formation in Al-containing Refractory High Entropy Alloys via Reactive Elements Addition |
| Author(s) |
Elaf A. Anber, David Beaudry, Charlie Brandenburg , Sebastian Lech, Michael Waters, Nathan Smith, James Rondinelli, Chris Wolverton, Elizabeth Opila, Jean Phillippe Couzinie, Mitra Taheri |
| On-Site Speaker (Planned) |
Elaf A. Anber |
| Abstract Scope |
Refractory high entropy alloys (RHEAs) hold the promise of superior mechanical properties at high temperatures, however, their oxidation resistance is still a major drawback because of the formation of non-protective scales. The classical concept (i.e. addition of Cr/Al) of providing oxidation resistance to high temperature alloys has been unsuccessful due to the inability to form a continuous scale. Using a combination of multiscale microscopy and thermodynamic calculations, we examined the role of Al and reactive elements (REs) addition on scale formation in RHEAs, and the alloys tend to passivate, forming continuous Al2O3, with decreasing REs/Al additions. We also observed the formation of complex oxides such as Nb2O5 and Nb2Zr6O17 with increasing Al/REs concentration. The structure, composition and density of these oxides will be discussed in terms of concentration of oxygen/metal vacancy. These results provide a one step closer towards designing new RHEAs that are better suited for high temperature environments. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |