Material model for dynamic recrystallization of Mg-8Al-0.5Zn alloy under uni-axial compressive deformation with variation of forming temperatures

Abstract

Due to insufficient formability of magnesium (Mg) alloys at the room temperature, it leads to a hot forming process for Mg alloys to enhance the formability and plastic workability. Mg alloy undergoes the dynamic recrystallization (DRX) during hot working process, which is a restoration or softening mechanism to reduce the dislocation density and release the accumulated energy to facilitate plastic deformation. Even though there are substantial progresses on the establishment in terms of the DRX principles and evolution with the view point of the materials science, an appropriate flow curve modeling for the finite element analysis has been deficient to take into consideration of softening behavior. This paper mainly concerns the material modeling of Mg alloy at the elevated forming temperature in terms of thermomechanical flow curves, which enables implementation of flow curve softening in the finite element analysis, efficiently. (c) 2015 Elsevier B.V. All rights reserved.