Deformation behavior of an ultrafine-grained Al-Mg alloy at different strain rates

An ultrafine-grained Al-Mg alloy was synthesized by the consolidation of cryomilled powders and subsequent hot extrusion. At strain rates of 10−4 and 10−3 s−1, the stress-strain curves show the serrated-flow behavior. At strain rates of 10−2 and 10−1 s−1, instead of the serrated flow, the shear band formation was observed.