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Meeting TMS Specialty Congress 2026
Symposium 4th World Congress on High Entropy Alloys (HEA 2026)
Presentation Title Designing Oxidation-Resistant AlVCrZrNbx Lightweight Refractory HEAs Through Nb Variable via Powder Metallurgy
Author(s) Gyosik Youn, Byungmin Ahn
On-Site Speaker (Planned) Gyosik Youn
Abstract Scope Achieving oxidation resistance while simultaneously satisfying “lightweight” and “refractory” requirements remains a challenge for high-entropy alloys designed for elevated-temperature applications. In this study, AlVCrZrNbx lightweight refractory HEAs were designed by treating Nb as a key compositional variable to regulate oxidation kinetics. Alloys with systematically varied Nb contents were fabricated via powder metallurgy to ensure compositional homogeneity despite large melting-point differences among the constituent elements. Isothermal oxidation tests revealed that Nb content strongly influences oxide growth rate, scale continuity, and stability. The observed changes in oxidation kinetics were closely associated with Nb-induced modifications in microstructural evolution and interfacial coherence at the metal/oxide interface. These results demonstrate that Nb-controlled kinetic stabilization provides an effective pathway for suppressing rapid oxidation in lightweight RHEAs.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Chemical Synthesis of HEA Powders from Metal Oxides for Catalyst Applications
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Influence of Chemical Short-Range Order on Stacking Fault Energy and Deformation in a CoCrNi-based Alloy
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