Influence of Lithium on the Kinetics of the Microstructural Transformations in 7075-Li Alloy

Abstract:

Differential Scanning Calorimetric(DSC) techniques are used to study the precipitation behaviour of 7075 aluminum alloys and the influence of Li on the microstructure transformation of the7075-Li alloy during aging. The kinetic parameters for GP zones and h phase dissolution are calculated in 7075 and 7075+Li alloys. The results show that Li slightly affects the activation energy for GP zones dissolution, but markedly raises the activation energy for h phase dissolution.