Evolution of microstructure and texture of AZ61 Mg alloy during net-shape pressing of extruded perform

摘要

The micro orientation theological behavior of AZ61 Mg alloy during net-shape forming of tensile specimens via close-die pressing of extruded preformed and the effect of the press deformation rate on the microstructure characteristics were characterized with electron back-scattering diffraction（EBSD）orientation imaging microscopy and metallography.The results indicate that the intensity distribution of basal{0001}＜1010＞texture on the cross-section of the extruded perform is uniform and parallel to the extrusion direction.Subjected to pressing in extrusion direction,deformation shear stress leads to grain rotation and basal texture {0001}＜1010＞deviation from the extrusion direction,spreading in the direction perpendicular to pressing direction.The texture intensity increases with the press deformation rate and reaches its peak value at 50%,which is considerably lower than the value reached in extrusion deformation.Then,the texture intensity decreases with the press deformation rate reversely.