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Influence of Cd and Sn on the Kinetics of the GP Zones Formation in Al-Zn-Mg

The influence of Cd and Sn on the GP zones formation has been studied for the solid solutions Al-Zn7%-Mg3%-Cd0.05%(wt) and Al-Zn7%-Mg3%-Sn0.05%(wt). From the hardness isotherms, the volumic fraction of the formed GP zones is determined for different times of ageing, at 80°C. The presence of Cd result in a retarding effect on the GP zones formation, and that of Sn to their suppression.