Comparative investigation on the modified Zerilli-Armstrong model and Arrhenius-type model to predict the elevated-temperature flow behaviour of 7050 aluminium alloy

True stress versus true strain curves obtained from isothermal compression tests over a wide temperature range from 573 K to 723 K and a strain rate range from 0.001 s^-1 to 1 s^-1 were used to evaluate the material constants of two models: the modified Zerilli-Armstrong (ZA) model and the strain compensation Arrhenius-type model. The suitability levels of these two models were evaluated by comparing both the correlation coefficient R and the average absolute relative error (AARE). The number of material constants involved in these two models was also compared. The results showed that the predictions of these two models were in good agreement with experimental data for 7050 aluminium alloy. Fewer material constants were involved in the modified ZA model, while better tracking of flow stress behaviour was obtained using the strain compensation Arrhenius-type model. The coupled deformation-heating effect was observed to be weak during the elevated-temperature deformation process.