Fig. 2.

Cold rolling of extruded specimens. a Photo showing one 3 mm thick plate extruded at 80 °C, and after 67 and 96% cold rolling without any trimming of specimen edges along the rolling direction. The strip cold rolled by 96% was cut into two pieces that were shaped into letters “mg”. b Photo showing a cold-rolled 1 mm strip that is bent by ~180° (spring back by ~10°) at room temperature. c Photos showing a cold-rolled 0.12 mm thick foil folded twice, then unfolded, without any visible cracks. Scale bars in a–c indicate 20, 3 and 5 mm, respectively