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The local deformation and fracture behavior of high-Zn Al-Zn-Mg(-Cu) alloys under hydrogen influence were investigated by in situ tests through synchrotron X-ray tomography. Intergranular and quasi-cl...eavage fractures were induced by hydrogen, and strain localization by the presence of cracks was not observed by 3D strain mapping. This result suggests that the strain localization at the crack tip is smaller than the measurement limit of 3D strain mapping. The average crack-tip-opening displacements, which are one of the crack driving forces specified by fracture mechanics, directly measured from the tomographic slice were 0.14 and 0.23 μm for intergranular cracks and quasi-cleavage cracks, respectively. The crack driving force of the intergranular and quasi-cleavage cracks was small. The local deformation behavior at the crack tips was analyzed based on fracture mechanics. The local deformation field of the crack tip, which was characterized using the Rice-Drugan-Sham (RDS) solution rather than the Hutchinson-Rice-Rosengren (HRR) solution, was located within 20 μm of the crack tip, and its size was limited. The results of this work clarify that the intergranular and quasi-cleavage crack growth are caused by small driving forces; however, this behavior is not perfectly brittle, accompanying local deformation at the crack tip.続きを見る
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