Time- and space- resolved SAXS investigation of the effect of Mg on the precipitation of Al3(Sc,Zr).

This experiment consists in a time- and space- resolved SAXS study of the effect of Mg concentration on the precipitation of nano scale Al3 (Sc,Zr) precipitates with a core-shell structure. To investigate the impact of Mg, samples containing an Mg concentration gradient will be used and probed at different locations of the gradient. The SAXS study will be conducted in situ in order to investigate directly the effect of temperature on the different precipitation steps' kinetics. On top of results concerning the size, number density and volumic fraction of precipitates, both the in situ SAXS and ex situ anomalous SAXS experiments will allow to observe the chemical profile inside precipitates. This experiment will provide meaningful insight and results that are essential towards the development of novel Al-Mg-Sc-Zr alloys and their properties modelling.