Shear deformation behavior of Al-5% Mg in a semi-solid state

Shear tests have been carried out over a wide temperature range of 753-893 K, including temperatures below and above the solidus temperature, for an Al-5 wt% Mg alloy. The deformation behavior in the semi-solid state is divided into two regions, one is in a semi-solid state containing a discontinuous liquid and the other is in a semi-solid state containing a continuous liquid. An analysis of the activation energy suggests that the deformation in the latter region is associated with the lubricated flow. Deformation in the former region is likely to be a transition from the viscous glide creep in the solid state to the lubricated flow in a semi-solid state containing a continuous liquid. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.