|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solid State Precipitation
||Clustering and Precipitation in Al-Cu-Li Alloys: Influence of Minor Solute Additions on the Competition between Kinetic Paths
||Alexis Deschamps, Frederic De Geuser, Eva Gumbmann, Rosen Ivanov, Christophe Sigli
|On-Site Speaker (Planned)
Al-Cu-Li alloys developed for aerospace applications generally contain minor solute additions. These solute additions interact in a complex way with processing parameters (pre-deformation, ageing temperature, …) and change profoundly the kinetics path followed by the alloy towards the end distribution of strengthening precipitates. Their presence acts on a much broader scope that simply modifying the distribution of equilibrium phases, and involves interaction with excess vacancies, formation of clusters and precursor phases, and segregation at the interface boundaries. We will address the influence of small additions of Mg (and to a lesser extent of Ag and Zn) on clustering during natural ageing and on precipitation during artificial ageing. Using a combination of advanced characterization tools at the atomic scale (STEM-HAADF, SAXS), we will show that non-equilibrium bifurcation of phase transformation paths depending on alloy composition can be driven by the early stages of the decomposition of the solid solution.
||Planned: Supplemental Proceedings volume