About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
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| Symposium
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Progress Toward Mechanisms, Thermodynamics, and Kinetics of Phase Transformations: An MPMD/SMD Symposium Honoring John H Perepezko
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| Presentation Title |
Intrinsic Ductility from Shear Amorphization: From Pure Metals to Multi-Principal-Element Alloys |
| Author(s) |
Duane D. Johnson, Morgan Jones, Nicolas Argibay |
| On-Site Speaker (Planned) |
Duane D. Johnson |
| Abstract Scope |
Design of structural alloys with both high strength and intrinsic ductility surpassing Ni-based superalloys is critical to address challenges like room-temperature (RT) processing for commercial use. A framework is proposed that reduces the complexities of valence-charge distribution, band-filling, and shear-strain effects into structure-property relationships describing the intrinsic ductility of metals and alloys to tailor properties with exceptional RT tensile ductility, strength, and high-temperature creep resistance, like for H-combustion electrical generators or fusion-plasma containment. We show that activation-energy density for amorphization (a lower energy fracture criterion) enables accurate assessment of intrinsic ductility and ductile-to-brittle transition temperatures. From analytical expressions with tabulated ab-initio stiffness/lattice constants and binary-interaction energies, our unified theory reconciles ductile flow in metals and solid-solution alloys. Phase diagrams generated for MPEAs explain both the high strength and RT tensile ductility, validating this framework for rapid design (with use of Perepezko’s self-healing protective coatings [Acta Mater. 246 (2023) 118719]). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Phase Transformations |