| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Unlocking Uniformity: Investigating the Influence of Reactive Element Additions and Al-Zr Intermetallics on Al2O3 Formation in RHEAs |
| Author(s) |
Elaf A. Anber, David Beaudry, Charlie Brandenburg, Sebastian Lech, Elizabeth Opila, Mitra Taheri |
| On-Site Speaker (Planned) |
Elaf A. Anber |
| Abstract Scope |
Refractory High Entropy Alloys (RHEAs) often suffer from poor oxidation resistance in high-temperature environments, leading to disintegration into powder. While passivating elements like Al and Cr have been added to enhance oxidation resistance, achieving a continuous scale remains a challenge. In this study, we propose a novel approach to achieve full passivation scale by designing non-equimolar alloys with Al additions and varying concentrations of reactive elements. Additionally, we investigate the impact of Al-Zr intermetallic formation on the oxidation resistance of RHEAs. High resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS) have been used to investigate the role of reactive elements addition and intermetallic on scale formation.Our preliminary results reveal that alloys with lower Zr content formed semi-continuous passivation scales.This study contributes to advancing the understanding and application of RHEAs in high-temperature environments. |