Modeling of extrusion texture of AZ31 magnesium alloy with consideration of dynamic recrystallization

摘要

In order to model the extrusion textures of alloy AZ31 at high temperatures, a new dynamic recrystallization (DRX) model is developed and integrated into polycrystal plasticity model as a contributor to texture development and softening behaviors. New grains are allowed to nucleate and give birth to new recrystallization grains, which enables the dominant aspects of the DRX to be simulated. In so doing, the investigation of DRX behaviors becomes less dependent of experiments. The initial orientations of new grains are determined by making assumptions and eliminating the false ones by verifications. Therefore, the deformation textures at high temperatures are simulated based on a reliable hypothesis and show good agreement with published experiments. Furthermore, finite element model (FEM) with Eulerian adaptive meshing approach is used to simulate the extrusion process at high temperatures with isotropic material properties assumed. History strains are tracked by tracers flowing through the Eulerian domain and used as input when simulating extrusion textures.