Mécanisme de branchement et précipitation lamellaire dans l’alliage Cu-7, 5 àt. % In

Abstract

The aim of this work is to make the evidence on the one hand the effect of the plastic deformation on the mechanism of the discontinuous precipitation and the lamellar precipitate morphology in the Cu-7, 5 at. % In alloy. Different techniques of analysis have been used in this respect such as the optical microscopy, the differential thermal analysis and electron and transmission microscopy.The obtained results during aging of the alloy Cu-7, at 5.% In at 400 ° C confirm various works achieved in this field, it was observed that the lamellar precipitates develop starting from a grain boundary and deferent lamellar orientations in the same cell were observed. The discontinuous reaction can also develop in the interphase boundaries and the branching mechanism is the favourable mode of the precipitate lamellas multiplication.