Abstract
Abstract A range of precipitate free zone (PFZ) widths containing different solute composition profiles have been developed in an Al-5.9 Wt% Zn-3.2 Wt% Mg alloy aged to produce similar overall microstructures. The initiation of stress corrosion cracking is shown not to be related to the PFZ width, but rather to the width of solute depletion within it. This behavior is explained in terms of a simple electrochemical model based on the polarization characteristics of the PFZ and grain boundary precipitates.
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