The flow behavior modeling of cast A356 aluminum alloy at elevated temperatures considering the effect of strain

The flow stress behavior of cast A356 aluminum alloy has been studied by a set of isothermal hot compression tests. The compression tests were carried out in the temperature range of 400-540 degrees C and strain rates of 0.001, 0.01 and 0.1 s(-1) up to a true strain of 0.6. The effects of temperature and strain rate on deformation behavior were represented by Zener-Hollomon parameter in an exponent type equation. Employing an Arrhenius-type constitutive equation, the influence of strain has been incorporated by considering the related materials' constants as functions of strain. The accuracy of the developed constitutive equations has been evaluated using standard statistical parameters such as correlation coefficient and average absolute relative error. The results indicate that the strain-dependent constitutive equation can lead to a good agreement between the calculated and measured flow stresses in the relevant temperature range. (C) 2011 Elsevier B.V. All rights reserved.