4 Analysis by EBSD 4.1 Grain/subgrains and texture A lot of quantitative information can be obtained from one EBSD scan. Taking the orientation maps of Figs. 3(e) and (f) for example, the same color means similar orientation. Low angle grain boundaries (LAGBs), with misorientations of 1.5°15° and high angle grain boundaries (HAGBs), with misorientations above 15°, are marked with thin blue lines and thick black lines, respectively. It is apparent that Fig. 3(e) shows a mixture of elongated coarse grains, twins (examples are marked by A and B) and fine-grain bands. In Fig. 3(f), the grains are slightly elongated and aligned at about 11° to the extrusion axis. The grain and subgrain size distributions (equivalent circle diameter) can be easily obtained from the orientation maps, as shown in Fig. 9 [1]. Figure 9 shows the evolution of grain size with increasing strain of SPD and the mean subgrain and grain sizes of these distributions. Details can be found in Ref. [1