Lotter, F.F.LotterPetschke, D.D.PetschkeGeuser, F. deF. deGeuserElsayed, M.M.ElsayedSextl, G.G.SextlStaab, T.E.M.T.E.M.Staab2022-03-062022-03-062019https://publica.fraunhofer.de/handle/publica/25965210.1016/j.scriptamat.2019.04.031The influence of trace elements (0.01 at.% In/Sn) on the decomposition process of Al-Cu-(Mg) alloys during the very early stages of natural ageing has been investigated in situ by small angle X-ray scattering supported with differential scanning calorimetry and hardness measurements. In the binary Al-Cu alloy quenched-in vacancies are bound to In or Sn, resulting in a suppressed Cu clustering process. In Al-Cu-Mg room temperature hardening occurs much faster due to Mg entering the clusters. However, the influence of In or Sn is negligible. Cu and Mg possibly form complexes with quenched-in vacancies before they can reach a trace element atom.en666669journal article