Constitutive equations relate thermo-mechanical parameters, i.e., strain (?), strain rate, and temperature (T) with flow stress (ó). The most popular constitutive relationship, among those used in the study of hot deformation, is the phenomenological sinh Garofalo equation. In recent years, several papers have described the hot deformation of aluminum alloys by mean of hot torsion testing. However, sinh constitutive parameters are seldom available in the literature even for the commonest aluminum alloys used today by the extrusion industry. This paper presents the result of torsion tests which provide parameters for constitutive equations for AA6005A, AA6063, and AA7020 alloys. The relative extrudabilities of these alloys were estimated by means of FEM simulation carried out by the HyperXtrude~R software.
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