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

• Published in: Computational materials science 2013-04, Vol.71, p.56-65
• Main Authors: Li, Jiang, Li, Fuguo, Cai, Jun, Wang, Ruiting, Yuan, Zhanwei, Ji, Guoliang
• Format: Article
• Language: English
• Subjects: 7050 Aluminium alloy; Applied sciences; Arrhenius-type model; Elasticity. Plasticity; Exact sciences and technology; Isothermal compression tests; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Modified Zerilli–Armstrong model
• ISSN: 0927-0256; 1879-0801
• DOI: 10.1016/j.commatsci.2013.01.010

► 7050 Aluminium alloy flow behaviour study using modified ZA and Arrhenius model. ► Compensation strain Arrhenius model prediction displayed a better accuracy track. ► Coupled deformation-heating effect was weak for 7050 aluminium alloy. True stress versus true strain curves obtained from isothermal compression tests over a wide temperature range from 573K to 723K and a strain rate range from 0.001s−1 to 1s−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.