Modeling of plastic deformation of magnesium alloys with random texture: A challenge to constitutive model for twinning

Crystal plasticity based constitutive models have been successfully applied to plastic deformation of magnesium (Mg) alloys with strong textures. However, there has not been even one single case where crystal plasticity could accurately simulate plastic deformation of Mg alloys with random texture. This is due to the fact that a random texture of a polycrystal results in a wide range of the Schmid Factor for twinning, and twinning in the polycrystal is expected to be very gradual, which is distinct from the cases with very strong textures. Modeling of plastic deformation of a random texture is thus very challenging. In the present work, an improved EVPSC-TDT model is applied, for the first time, to successfully model the deformation behavior of a randomly textured Mg-2w.t.%Al under uniaxial tension and compression.