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The purpose of this work is the investigation of the microstructural evolution in aluminium alloys during extrusion at high temperature and subsequent cooling. In particular, the alloy EN AW-6060 of the 6000 series (Al-Mg-Si) is examined here. Subject to such process conditions, the microstructural development in this high stacking-fault material is controlled mainly by dynamic recovery during extrusion and static recrystallisation during cooling. To characterize this development in more detail, EBSD measurements are carried out on different parts of a partly extruded specimen. From this sample, microstructural images are generated and a statistical analysis is performed. Our initial simulation results of the microstructural development during this process show good qualitative agreement with the trends found experimentally via the EBSD investigation.

The purpose of this work is to model the dynamic microstructure evolution of aluminium alloys during hot metal forming processes such as extrusion. To this end, a phenomenological model based on the physical assumption that evolution of microstructure properties saturates after reaching the steady-state forming conditions is formulated. This model in combination with a thermo-elastic viscoplastic material model is implemented in the Finite Element (FE) software Abaqus. Simulation results for the microstructural development during extrusion as a function of process conditions demonstrate the sensitivity of microstructure development to these conditions. Comparison of the simulation results for the microstructure evolution with corresponding experimental results show good qualitative agreement.