after the first low-resolution map was recorded at 114 N (about 10 minutes), and did not evolve with the force maintained at 114 N for at least 1.5 hours. The stress concentration zone then transferred to point 3 after 3 hours (Fig. ), due to progressive cracking of mechanical bridges that hindered crack propagation at point 2. The microstructure did not evolve when the last map was recorded after 4 hours at 114 N (Fig. ). The separation between each mechanical asperity is roughly 100 µm, from defect 0 (notch tip) to defect 3.