| Abstract Scope |
In the spirit of Hume-Rothery and data-driven materials discovery, we offer a re-analysis of what controls metal/alloy properties (strength, ductility, stability,…) and defect energies (vacancy, surface, grain boundary, stacking faults,…) to tailor properties in concentrated alloys with exceptional tensile ductility, strength, and creep resistance. With an eye to enable next-generation energy technologies, we show that activation-energy density for an amorphous interface (a lower energy fracture criterion than cleavage) enables accurate assessment of intrinsic ductility and ductile-to-brittle transition temperatures. From which, we can correlate properties of metallic systems to a single electronic-based feature, applicable (it appears) universally, providing a physics-based materials discovery framework that reduces complexities of valence-charge distribution, band-filling, and shear-strain effects into structure-property relationships that reconciles ductile flow in metals/alloys. relationships that reconciles ductile flow in metals/alloys. Such correlated-data design of structural alloys with high strength and intrinsic ductility guides room-temperature processing to aid in commercial use, and phase diagrams explain these simultaneous properties.
*Funded in part at Ames Lab and ISU by DOE ARPA-E CHADWICK Program |