About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Nanoscale Origins of Passivation in a Refractory High Entropy Alloys |
Author(s) |
Elaf A. Anber, David Beaudry, Daniel Foley, Lavina Backman, Keith Knipling, Elizabeth J Opila, Jean Philippe Couzinié, Mitra L Taheri |
On-Site Speaker (Planned) |
Elaf A. Anber |
Abstract Scope |
Refractory high entropy alloys (RHEAs) are being targeted for high-temperature applications, such as aerospace industries, due to their high melting temperature, and promising combination of high strength and low ductility. A key challenge in the advancement of RHEAs is maintaining high temperature stability and oxidation resistance. Here we describe the recent progress of oxide evolution studies of an AlxHfNbTiTaZr (x=0.0,0.25, and 0.75) RHEA in high temperature environments. In this study, the role of Al addition on oxide structure, evolution, and complexity was studied using theoretical calculations coupled with phase and orientation analysis using precession electron diffraction techniques. Overall, the work described provides a foundation for understanding the oxide stability window for candidate RHEAs in extreme environments. These results are discussed in the context of the growing literature comparing the ideal methods for passivation mechanisms in complex alloys for use in high temperature, corrosive environments. |
Proceedings Inclusion? |
Undecided |