Fig. 4: Compositional fluctuation on the grain boundary ahead of the stress-corrosion crack. | Nature Communications

Fig. 4: Compositional fluctuation on the grain boundary ahead of the stress-corrosion crack.

From: Revisiting stress-corrosion cracking and hydrogen embrittlement in 7xxx-Al alloys at the near-atomic-scale

Fig. 4: Compositional fluctuation on the grain boundary ahead of the stress-corrosion crack.

a APT reconstruction of the grain boundary ahead of the crack; b Composition profile showing a η-phase grain boundary precipitate with an Mg composition increased with respect to the 33 at.% dictated by the stoichiometry of the Mg(Zn, Cu, Al)2 phase. The error bars correspond to the standard deviation within each of the bins in the profile. The displayed reference values are measured across the GBP shown in Supplementary Fig. 1a, with the average composition values shown in Table 1. Grain Boundary Precipitate (GBP). Precipitate-Free Zone (PFZ).

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