Fig. 1. SEM images of the surfaces after small punch tests to simulate deformation up to 25%. Cracks and delamination were observed under some TT and PIII conditions. Selected conditions for the further steps of the study were EP, as a base surface, 400 °C for 1 h for TT and −0.1 kV for 1 h for PIII. Magnification of 2000× was used for all of the images. TT and PIII images were all obtained after deformation.
