Material law parameter determination of magnesium alloys

The deformation mechanisms of magnesium are investigated in order to obtain results for a better understanding of texture evolution and anisotropic behavior of magnesium wrought alloys. However, the insight into hcp plasticity is restrained by the fact that the deformation of hcp materials consists of three or more deformation modes, which complicates micromechanical modelling. In this paper it is demonstrated in case of magnesium alloys that an inverse parameter calculation of plasticity parameters can be significantly improved by a simulation strategy which is based on an appropriately chosen set of experiments. Room temperature deformation tests were performed on the magnesium model system AZ31. The results were simulated by using a viscoplastic self-consistent model. It is concluded that the results of rolled sheets are not sufficient, by contrast the results of extruded bars are a firm basis for model calculations. The results indicate that the initial textures must favor all relevant deformation modes. (C) 2009 Elsevier B.V. All rights reserved.