This article deals with investigation of fine-scale precipitation in Al-Mg-Zn alloys with compositions of Al - 2 at% Mgx
at% Zn, (x = 1.8, 2 and 4.2). The precipitates morphology was examined by scanning electron microscope (SEM) and
correlated with the microhardness (HV) and differential scanning calorimetry (DSC) of the specimens. The precipitates
are characterized as ’ (MgZn2) and  (MgZn2) phases of hexagonal structure of the same composition with a slight
difference in lattice parameters. In addition, T-phase pf composition (Mg32 (Al, Zn)49) having a cubic crystal structure.
Owing to the determined activation energies of the precipitates, the kinetics associated with their nucleation and growth
can be characterized. The thermal energy acquired during aging leads to the agglomeration of precipitates to or larger
particle sizes.