HIGH RESOLUTION ELECTRON MICROSCOPY STUDY OF GUINIER-PRESTON (GPl) ZONES IN Al-Cu BASED ALLOYS

摘要

Guinier-Preston (GPl) zones in the model alloy Al-1.84 at./100 Cu and in the industrial alloy Al-1.69Cu-1.10Mg-0.33Mn at./100 (AA 2017A) were studied by means of high resolution electron Microcopy. The experimental images are interpreted using multislice simulations. The majority of GPl Zones consist of atomic monolayers, the disc diameter ranging from 4 to 10 nm. In the binary alloy, double Layer GPl zones and unstable disc shaped particles on {111} planes were also found.