About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Tuning Short-Range Order in Refractory High-Entropy Alloys for Enhanced Passivation |
| Author(s) |
Elaf A. Anber, David Beaudry, Debashish Sur, Georgia Leigh, Howie Joress, Brian DeCost, Jean Phillippe Couzinie, John Scully, Mitra Taheri |
| On-Site Speaker (Planned) |
Elaf A. Anber |
| Abstract Scope |
Refractory TiNbZr-based alloys exhibit promising high-temperature strength and oxidation resistance, partly due to short-range chemical order (SRO). In this work, we investigate the influence of alloying additions, including Hf, Ta, and Cr, on SRO and passivation behavior. Using Extended X-ray Absorption Fine Structure (EXAFS), we characterize the evolution of local atomic environments across multiple alloy compositions. We further examine the relationship between SRO and oxidation resistance by combining high-resolution transmission electron microscopy (TEM) with electron energy loss spectroscopy (EELS) to probe the composition and structure of native passivation layers. Our results aim to identify how specific elemental additions modify SRO and stabilize protective surface oxides, providing fundamental insights for designing next-generation refractory high-entropy alloys (RHEAs) with improved corrosion resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Entropy Alloys, High-Temperature Materials |