Comparison Study of Constitutive Models in Predicting the Hot Deformation Behavior of AA6060 and AA6063 Aluminium Alloys

Abstract The aim of the present paper is to study the hot deformation behavior of two different Al alloys (AA6060 and AA6063) by means of hot torsion tests in the 400-550°C temperature range, typical of real extrusion temperatures. The behavior of the alloys, in terms of equivalent stress vs. equivalent strain, was modeled by different constitutive equations: Power law, Garofalo and Hensel-Spittel equations defined for different parameters. The flow stress curves predicted by the models were compared with experimental results for both alloys and discussed in order to define the accuracy of the models in predicting the materials hot flow stresses.