In-situ high-temperature tensile test for phase stress and dislocation density measurements by synchrotron X-ray diffraction in an additivel

This proposal intends to conduct an in-situ synchrotron X-ray powder diffraction (XRPD) experiment during high-temperature loading on a novel additively
manufactured (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 between
different 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 engineering
applications.