Abstract
Guinier-Preston (GP1) zones in the model alloy Al-1.84 at. %Cu and in the industrial alloy Al1.68Cu1.10Mg0.33Mn at.% (Aa 2017A) were studied by means of high resolution electron microscopy. The experimental images are interpreted using multislice simulations. The majority of GP1 zones consist of atomic monolayers, the disc diameter ranging from 4 to 10 nm. In the binary alloy, double layer GP1 zones and unstable disc shaped particles on {111} planes were also found. The contrast of the GP1 zones is strongly dependent on their size, on the foil thickness, on the defocus of the objective lens, less sensitive to the Cu content and much less sensitive to the position of the GP zone in the depth of the foil.
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