Experimental Investigations and Numerical Simulations of Textures and Microstructures of Extruded Aluminum Alloys

摘要

A physically-based modeling framework for evolving extrusion microstructure is proposed in this work. All the important phenomena happening during extrusion are described by corresponding constituent models. A Finite Element Method (FEM) model is used to simulate material flow. A physically-based sub-structure and work-hardening model is employed for the deformation structure evolution during extrusion. The deformation texture is predicted by crystal plasticity models. The recrystallization behavior is simulated by the combined recovery and recrystallization model ALSOFT, accompanied by an appropriate texture model to account for the final recrystallized texture. Following this modeling framework, the final extrusion microstructure can be predicted in terms of texture, recrystallization fraction, and grain (subgrain) size. Round profile extrusion of aluminium alloy 6063 (AA6063) material was performed at both low and elevated temperatures, corresponding to 300°C and 450°C, respectively. The extrusion microstructures were measured experimentally and predicted by the proposed framework. Except for the recrystallization texture, the modeling framework gave predictions in a quantitatively reasonable manner.