|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||2018 Technical Division Student Poster Competition
||SPG-20: Modelling of Precipitate Evolution and Yield Strength of a Friction Stir Welded Al-Cu-Li Alloy
||Barnali Mondal, Aniket Dutt, Rajiv S. Mishra
|On-Site Speaker (Planned)
An overall process model to predict the precipitate evolution and associated change in the yield strength during friction stir welding (FSW) of an Al-Cu-Li alloy has been developed. A thermal pseudo mechanical (TPM) model is developed for the FSW process using heat transfer module in COMSOL and is based on a heat source wherein the temperature dependent yield shear stress is used for the heat generation. The precipitation and coarsening model is based on the Kampmann and Wagner theoretical framework and accounts for the competition between the various heterogeneous nucleation sites like grain boundaries and dislocation for both metastable and equilibrium precipitates. The model predicts different precipitate mean radius and volume fraction for the various zones in the friction stir welded material. The predictions of the model have been verified against experimental data from literature.A model for the yield strength is developed which considers contributions from different strengthening mechanisms.