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Crack growth in stress corrosion cracking (SCC) in 7xxx Al alloys is anintermittent process, which generates successive crack arrest markings (CAMs)visible on the fracture surface. It is conjectured that H is generated at thecrack tip during crack arrest, which then facilitates crack advancement throughhydrogen embrittlement. Here, nanoscale imaging by 4D-scanning-transmissionelectron microscopy and atom probe tomography show that CAMs are produced byoxidation at the arrested crack tip, matrix precipitates dissolve and solutediffuse towards the growing CAM. Substantial homogenous residual strain remainsunderneath the fracture surface, indicative of non-localized plastic activity.Our study suggests that H induces crack propagation through decohesion.

Crack arrest markings in stress corrosion cracking of 7xxx aluminium alloys: insights into active hydrogen embrittlement mechanisms