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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Study on high temperature properties of Nb-controlled refractory high-entropy alloys
Author(s) Gyosik Youn, Byungmin Ahn, Younggeon Lee, Hansung Lee
On-Site Speaker (Planned) Gyosik Youn
Abstract Scope Refractory high-entropy alloys (RHEAs) are composed of refractory elements with high melting points, offering exceptional high temperature strength and heat resistance. However, their widespread application is limited by high density and the tendency to form thermally unstable oxides, which compromise structural integrity at elevated temperatures. In this study, a lightweight and oxidation-resistant AlVCrZrNb RHEA was designed to overcome these limitations. And the Nb content was systematically varied to optimize high-temperature strength while minimizing the formation of unstable oxides. Alloying between elements with markedly different melting points was achieved via a powder metallurgy process. The resulting mechanical performance and oxidation behavior were investigated in relation to microstructural evolution. Especially, the correlation between lattice distortion and interfacial coherence with properties was analyzed at atomic scale. This study will provide insights into how microstructural evolution induced by varying Nb fractions influences the oxidation behavior and mechanical performance.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Powder Materials, High-Temperature Materials

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Accelerated screening of composition-structure-property relationships in MPEAs
Accurate Determination of the Deformation Mechanisms in Refractory Compositionally Complex Alloys
Achieving Deformation-Induced Nano-sized Twins and hcp Structures in FCC Complex Concentrated Alloys Under Charpy Impact Testing
Additive Manufacturing: From Complex Alloys to Simple Alloys
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Atomistic Tracking of Self Diffusivity in Multi-Principal Element Alloys
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CALPHAD-Guided Development and Mechanical Evaluation of Dual-Phase CoFeNiVTi Alloys
Combinatorial microstructure & stoichiometry-based and hybrid machine learning & domain knowledge for hardness mapping in a high-entropy alloy
Comparison of NbxMo1-x and (VNbTa)xMo1-x Refractory MPEA Thin Films by In Situ Microcantilever Beam Bending
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Dry Sliding Wear of Cu-Alloyed Low-Carbon Steels: Role of Oxides and Quenching Temperature
Ductile-Brittle Transitions in bcc Refractory High-Entropy Alloys
Dynamic properties of NbTaTiHf High-Entropy Alloy
EBSD analysis of microstructure evolution in hot-deformed WMoFeNi MPEA Alloy system
Effect of minor Ge/Mo/W on the corrosive behavior in FCC CoCrFeNi high-entropy alloy
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