High‐strain‐rate Superplasticity in a Nanostructured Al‐Mg Alloy

Abstract

In this work, the authors report high‐strain‐rate superplasticity in a nanostructured Al‐7.5%Mg alloy with a mean grain size of 90 nm processed via consolidation of cryomilled Al‐Mg powders. Tensile ductility with an elongation of 291% was observed at a strain rate of 10‐1 s‐1 and at a temperature of 573 K. Noteworthy is the fact that the microstructure is essentially stable during testing at 573 K. Grain boundary sliding is suggested to be the dominant deformation mechanism in the superplastic deformation of the nanostructured Al‐Mg alloy.