Actually the role of the stress during precipitation is rarely taken into account, although it is a key parameter influencing both the structure and the chemical composition of precipitates. Indeed, during the early stages of precipitation, nano-particles shape (platelet, sphere,…) and chemical composition are very badly understood : due to their size they are much likely to be influenced by the surrounding matrix for chemical (bonds between matrix and precipitates) and mechanical reasons (misfit between precipitate and matrix,…).
The objective of this study is to better understnad the interaction between precipitation and stress in order to explain the shapeand chemistry of the observed nano-precipitates, and in fine the interaction of the dislocations, which control the deformation.
Collaboration
P. Donnadieu (LTPCM – SIMAP – Grenoble)