Flow stress modeling of AZ91 magnesium alloys at elevated temperature

The flow curve is constructed by flow stress data obtained from compression test conducted at different temperature and strain rate. Accurate flow stress model is crucial for investigating magnesium alloys deformation behaviour at the elevated temperatures. An analytical method, which reflects temperature, strain and strain rate effect by introducing temperature-compensated strain rate (Zener–Hollomon Parameter), is proposed in this study. This model has been applied on the experimental data and predicted flow stress curve match well with those measurements.

Research highlights► In this study, a Zener–Hollomon parameter based analytical method is introduced and demonstrated for AZ91 Mg alloy. ► An analytical model is proposed to describe the flow stress evolution. ► Zener–Holloman parameter is introduced to reflect the combination effect of temperature and strain rate. ► The model is verified by using previously published results.