Twins in asymmetrically rolled AZ31 analyzed with a Transmission Electron Microscope Orientation mapping tool
Résumé
An AZ31 sheet was rolled in symmetrical and asymmetrical conditions to a total reduction of 50%. Twins and double twins are the dominant structural features observed after deformation. They were analyzed systematically with the help of a dedicated TEM attachment that provides orientation maps at nanoscale. This particular characterization technic is similar to SEM-EBSD tools but far less sensitive to strains. Twinning is shown to differ substantially with the introduction of a shear component. Despite their frequency, it is argued that twins have little effect on the forming process.