2020/10/26 by Shi, Yitong, Joseph, Sudha, Saunders, Edward A. +4
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)
paper · doi:10.48550/arxiv.2010.13875
The mechanism of AgCl-induced stress corrosion cracking of Ti-6246 was examined at \SI500\mega\pascal and \SI380\celsius for \SI24\hour exposures. SEM and STEM-EDX examination of a FIB-sectioned blister and crack showed that metallic Ag was formed and migrated along the crack. TEM analysis also revealed the presence of \ceSnO2 and \ceAl2O3 corrosion products mixed into \ceTiO2. The fracture surface has a transgranular nature with a brittle appearance in the primary α phase. Long, straight and non-interacting dislocations were observed in a cleavage-fractured primary α grain, with basal and pyramidal traces. This is consistent with a dislocation emission view of the the cracking mechanism.