ملخص: Precipitation sequence and changes in microhardness measurements of Al-8wt%Mg and Al-12wt%Mg alloys have been investigated by differential scanning calorimetry (DSC). It has been confirmed that the most important hardening is caused by the formation of the intermediate particles [beta]'(Al3 Mg2) which precipitate at temperatures above the reversion temperature of the GP zones. The [beta]' particles nucleation occurs certainly on structural heterogeneities introduced by quenching (dislocations formed by the collapse and shear of discs of vacancies). When the amount of the heterogeneities facilitating the nucleation of [beta]' (the intermediate phase) decreases a direct formation of [beta] (the equilibrium phase) is observed.

لغة: إنجليزية