Abstract
Two different experimental techniques, small angle neutron scattering and transmission electron microscopy studies were used to determine the size distribution of Guinier-Preston (GP) zones in binary Al-4 wt% Cu. Both methods complement each other with respect to the resolution of the two sizes, diameter and thickness, of the platelets. Both diameter and thickness followed during ageing at T = 423 K a power law behaviour with an exponent of n = 2 for short ageing times, when GP I-zones exist. At longer ageing times the precipitation process was dominated by the nucleation and growth of GP II-zones.
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