Proceedings of the Ultrafine Grained Materials IV Conference
Zhu, Y. T.
Langdon, T. G.
Zehetbauer, M. J.
Semiatin, S. L.
Lowe, T. C.
Ultrafine Grained Materials IV
TMS (The Minerals, Metals & Materials Society)
[en] ECAP ; Mechanical testing ; Yield Surface
[fr] Inhomogeneous deformation
[en] Hot-rolled AA1050 commercial pure aluminum was deformed by ECAP (Equal Channel Angular Pressing) at room temperature following route BC for 8 passes. Mechanical testing at room temperature on both hot-rolled aluminum and aluminum after ECAP consisted of uniaxial tension, axisymmetric compression and shear by torsion. The phenomenological Hill’s criterion identified from texture data accounts for the observed tension-compression asymmetry due to ECAP and predicts torsion yielding close to measurements. FE simulations of the compression tests are performed with a Hill model or a Minty micro-macro model and coupled with an isotropic Voce saturation hardening law. These simulations compute the inhomogeneous behavior due to barreling, the observed sample anisotropy and the force-displacement curve. Comparisons of numerical and experiments results provide a first identification of the hardening parameters and the friction coefficient during compression tests.