A study of the hardening precipitation in a 2650 aluminium alloy for aeronautics
Résumé
This paper focus on the hardening precipitation in a 2650 Al(CuMg) aluminium alloy and on its interactions with the aluminium matrix. The study has been carried out using High Resolution Transmission Electron Microscopy (HRTEM) images analysis and simulated images. Two types of precipitation (an homogeneous one and an heterogeneous one) and two types of precipitates (fine needles and S-laths) can be distinguished. A tomographic atom probe analysis of the fine needles reveals a strong copper and magnesium atom enrichment. The lath shaped precipitates can be sorted into two types, each one presenting specific interface morphology and orientation relationship with respect to the matrix.