This proposal intends to conduct an in-situ synchrotron X-ray powder diffraction (XRPD) experiment during high-temperature loading on a novel additivelymanufactured (AM) Al-La alloys, which exhibits an exceptional high-temperature strength due to the thermally stable nano eutectic cellular network (nano-ECN)microstructure. It is suggested that the nano-ECN not only provides excellent load bearing capacity but also constrains the dislocation motion for a profound Hall-Petch strengthening at elevated temperatures. For quantitative validation, we would like to perform XRPD experiments to evaluate stress partitioning betweendifferent phases and evolution of dislocation structures via refinement and fitting of diffraction peaks in real-time during high-temperature loading in the AM alloy.The results are expected to give a deep understanding of the microstructure-properties relationships in the thriving AM materials and promotes their engineeringapplications.

The goal of this proposal is twofold. On the one hand it aims at improving the previously developed setup allowing simultaneous WAXS/XPCS measurements besides by adding a SAXS detector in order to track the structural evolution at the nanometer scale. On the other hand, the goal is to consolidate the previously carried out measurements and to go deeper in order to answer the remaining questions. In this way, one aim is to determine if the slowdown of the relaxation times observed with the increase of crystallinity arises from a constraining effect due to the formation of crystalline lamellae and/or originates from an increase of nanoparticles concentration (i.e. tracers) into the amorphous domains involved by a segregation effect. Also, more precise and exhaustive measurements will be carried out on stretched samples in order to confirm the fact the dynamics heterogeneities and to determine the critical orientation degree above which they are observed.