|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Grain Size Modelling and Simulation during Hot Torsion of AW6082 Aluminium Alloy
||Sanjeev Kumar, Jules Franz Thierry Simonet Fotso, Friedrich Krumphals, Cecilia Poletti
|On-Site Speaker (Planned)
Grain refinement in most aluminium commercial take place by continuous dynamic recrystallization. Therefore, flow-steady-state occurs at large plastic strains, even at high temperatures and low strain rates. In this work, we simulate the grain size evolution during hot torsion tests using FEM. Thus, a model based on dislocation densities and misorientations evolutions was developed and implemented in DEFORM. Results of the simulations were validated with microstructural characterization of AW6082 samples deformed under hot torsion between 300-500°C using a GleebleŽ3800. Electron back scattered diffraction was used to obtain misorientation distributions and grain sizes. It was shown that during deformation at high temperatures, firstly cell formation happens by dynamic recovery. As deformation increases, the wall dislocation density reaches a maximum value that decreases due to formation of new high angle grain boundaries, refining the microstructure. The softening is due to absorption of dislocation density by the existent and also new created boundaries.
||Planned: Light Metals