Mechanical properties and microscopic deformation mechanism of polycrystalline magnesium under high-strain-rate compressive loadings

► Yield strength is insensitive to strain rate ε˙. ► Ultimate stress, fracture strain, work hardening rate are highly sensitive to ε˙. ► Three deformation regimes exist on the quasi-static and dynamic stress-strain curves. ► Twinning/detwinning is the dominating mechanism for quasi-static testing. ► DRX and twinning/detwinning are the dominating mechanisms for dynamic testing.