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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Alloy Behavior and Design Across Length-Scales: An SMD Symposium Honoring Easo George
Presentation Title Theory-guided Design of High-strength, Ductile, Single-phase BCC High Entropy Alloys
Author(s) William A. Curtin, You Rao, Carolina Baruffi, Anthony De Luca, Christian Leinenbach
On-Site Speaker (Planned) William A. Curtin
Abstract Scope The immense compositional space of High Entropy Alloys presents possibilities of discovering compositions satisfying multiple application requirements. We introduce a theory-based parameter-free alloy selection procedure to satisfy specified mechanical and thermodynamic properties. We first make selections of equiatomic quinary BCC refractory HEAs in the family Cr-Mo-W-V-Nb-Ta-Ti-Zr-Hf to find alloys that are single-phase, high melting point, and strong and ductile at room temperature. We identify HfMoNbTaTi as the most-promising alloy. We then search within Hf-Mo-Nb-Ta-Ti with more-stringent design/performance criteria and find 10 quinaries with lower densities, higher specific strength, more-likely-ductile, and melting points above 2050C. We validate the selection procedure by fabricating and characterizing Hf15Mo25Nb20Ta5Ti35, confirming many predictions. Extensions to the quaternary Hf-Mo-Nb-Ti family identifies 15 new promising alloys for future study. Overall, our design procedure provides a theory-based way to quickly identify target alloys with a desired suite of properties, facilitating the discovery of next-generation materials.
Proceedings Inclusion? Planned:


Ambient-temperature Plasticity of Brittle Intermetallics at Micron-meter Size Scales
Challenges in the Design of Refractory Multi-principal Element Alloys
Deformation Mechanisms in Compositionally Complex Polycrystalline CoNiCr-based Superalloys
Deformation Twinning in HCP Ti: The Role of Interfacial Complexions and Interstitial Solutes
Easo George – Advancing Understanding of Mechanical Behavior through Test Material Preparation
Easo George - Recollections of His Youth
Factors Affecting Mechanical Twinning in Single-phase FCC and Polycrystalline MEAs and HEAs
Fracture Properties of High-entropy Alloys
From Superplasticity in Steels to the Great Pyramid of Giza
Functional High Entropy Alloys
Future Prospects of MoSiBTiC Alloys as Ultra-High Temperature Materials
Heat-Resistant Cr-Alloys, Microstructure, Oxidation and Creep
Low Temperature Deformation Mechanisms of CrMnFeCoNi High-entropy Alloy Polycrystals
Physical Metallurgy and Mechanical Properties of Iridium and Platinum Alloys Used in Power and Heat Sources Onboard Interplanetary Spacecraft
Predicting High Entropy Alloy Phase Stability across Length Scales
Solid Solution Hardening Effects on Thermal Stability and Mechanical Properties of Nanostructured Ni-enriched CrMnFeCoNi High Entropy Alloys
Some Unusual Aspects of the Deformation Behavior of FeAl
Strong Effects of Tiny Compositional Changes on Structural and Functional Material Properties
The Interplay between Phase Transformation and Mechanical Properties in High Entropy Alloys
Theory-guided Design of High-strength, Ductile, Single-phase BCC High Entropy Alloys
Utilizing Nanoprecipitates to Modulate Phase Transformation, Strength, and Ductility of HEAs

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