Abstract
The localised corrosion behaviour and the microstructure in an Al-2.23Cu-0.96Li (wt%) alloy were systematically investigated by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The major strengthening precipitate in the peak-aged alloy is the Guinier-Preston-Bagaryatsky (GPB) zones which nucleate and grow in the< 001 >Al directions, while the crystallographic corrosion appears and propagates along the {111}Al planes. At the nanometre scale, the features of crystallographic corrosion are made up of many step-like {100}Al-oriented sidewalls which are closely associated with the GPB zones. The GPB zones are unable to affect the overall propagation direction of the crystallographic corrosion, but is related to the formation of the nanoscale localised corrosion morphology of the crystallographic corrosion.
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