Crystallographic texture effect on the plastic deformation of indirectly extruded Mg-Zn based alloys with single additions of Ca and Nd.
The present work examines the deformation behavior of Mg-Zn based alloys with separate additions of Ca and Nd. After extrusion, the binary Mg-Zn alloy, the resulting texture is the classical basal type texture, with an alignment of basal planes and intensity along the arc between the <10-10> and <11-20> poles, independently of the extrusion parameters. In case of the Mg-Zn-Ca a distinctive <10-11> component develops after extrusion, whereas in the Mg-Zn-Nd the resulting component is the <11-21>. The effect of these textures on the related plastic activity of deformation modes and the respective mechanical behavior has been investigated through electron backscatter diffraction (EBSD) via ex-situ tensile deformation. The activity of different deformation modes on materials with a similar grain size and different texture were tested in tension and the mechanical behavior has been simulated by using the viscoplastic self-consistent (VPSC) model. The simulation results show that the prismatic slip plays an important role from the onset of plastic deformation in the Mg-Zn alloy. In contrast, the plastic deformation of Mg-Zn-Ca and Mg-Zn-Nd shows the dominance of basal slip, extension twins followed by an increase activity of prismatic <a> slip and pyramidal <c+a> slip. Those simulated results are confirmed through the ex-situ EBSD analysis of slip traces.