Modelling of the fine precipitates effect strengthening of Al-Mg-Si alloys under ageing

The paper presents the results of modelling by numerical simulation of the fine precipitates effect on the strengthening of Al-Mg-Si alloys under ageing. The sequence of metastable modes including Genie-Preston Zones (GPZ) and needle-like β"-phase particles arised during the multistep ageing in the alloy are taken into account when the strengthening effect described by the model. The utilization of the distribution function of the particles and account for the shape of precipitates allows to interpret the experimental results by changing of yield strength during ageing with a high precision and correspondingly to predict strength of the alloy.