Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate
Abstract Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300μm and this was reduced to ~250nm by ECAP and then increased to ~600nm by annealing at 673K for 10min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 −4 to ~10 3 s −1 . The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy.
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