Extraordinary high-strain rate superplasticity of severely deformed Al–Mg–Sc–Zr alloy

Superior superplastic behavior with elongations from 3000 to 4100% were found in temperature range of 400–475 °C at strain rates 10−2–10−1 s−1 for the severely deformed Al–5Mg–0.18Mn–0.2Sc–0.08Zr–0.01Fe–0.01Si alloy having homogeneous and thermally stable ultrafine-grain structure with ∼1 μm grain size and low amount of coarse excess phases.