Strain-dependent constitutive equations to predict high temperature flow behavior of AA2030 aluminum alloy

• The flow behavior is greatly affected by strain rate and deformation temperature.
• Strain has significant effect on the high temperature flow stress of AA2030 alloy.
• The hyperbolic law in Arrhenius-type equation gives better estimates between Z and σ.
• The developed strain-dependent constitutive equations give a precise estimate for flow stress of AA2030.

The experimental strain–stress data from isothermal hot compression tests were used to develop constitutive equations for hot deformation behavior prediction of AA2030 aluminum alloy. For this purpose, hot compression tests were carried out at the deformation temperatures from 350 to 500 °C and strain rate range of 0.005–0.5 s−1. The microstructure and flow stress of AA2030 alloy were evidently affected by both the deformation temperature and strain rate which the effects of these parameters on deformation behaviors were represented by Zener-Holloman parameter in an exponent type equation. The influence of strain was also incorporated in the constitutive equation by considering activation energy (Q) and all material constants as different functions of strain. The very good agreement between the measured and predicted results indicates the high accuracy of developed model and established strain-dependent constitutive equations in analyzing and predicting the hot deformation behavior of AA2030, at different temperatures and strain rates conditions.

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