A high-temperature deformation model based on dislocation movement for wrought aluminium alloys

Abstract

This paper presents a high-temperature deformation model based on dislocation movement for wrought aluminium alloys, which can exhibit the dynamic recovery and dynamic recrystallisation processes of a wrought aluminium alloy at the same time. In the model, work hardening corresponds to the increase of dislocation density. Dynamic recovery occurs in two ways, namely by the condensation of dislocations into new low-angle boundaries, and by the absorption of dislocations into pre-existing boundaries. High- and low-angle boundaries disappear by the sweeping of high-angle boundary migration. The prediction of the model is presented for the high-temperature deformation of the 7050 aluminium alloy. Predicted true stress–strain curves and microstructure evolution from the model are consistent with experimental data.

Keywords:

• Aluminium alloy
• High-temperature deformation
• Modelling and simulation
• Dislocation
• Microstructure

Acknowledgements

This work was supported by National Nature Science Foundation of China (NSFC-51575522), and State Key Laboratory of Materials Processing and Die & Mould Technology (P2016-02).