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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.15: Poster

Montag, 16. März 2020, 18:15–20:00, P4

Copper Precipitates in Aluminum Alloys studied by Positron Annihilation Spectroscopy — •Leon Chryssos, Thomas Gigl, and Christoph Hugenschmidt — Physics Department E21 and Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München

Aluminum alloys are an integral part of modern engineering. However, due to its poor welding properties and rigidity, pure aluminum is not suitable for most industry applications. Therefore, most of the shortcomings of pure aluminum can be mitigated by alloying percentage amounts of copper. The formation of copper precipitates in the aluminum lattice introduces strain and, hence, improves rigidity. Due to its, in comparison to Al, greater positron affinity, Cu clusters can be detected in AlCu alloys using Coincident Doppler Broadening Spectroscopy (CDBS). To better understand the precipitation process the Al alloy EN AW-2219 T87 was treated under different conditions ,i.e. samples were prepared using different artificial aging procedures. Afterwards they were analysed using the CDB Spectrometer at NEPOMUC/FRMII of the TU München. With this method it was possible to determine optimal aging parameters for the alloy. A summary of the investigated procedures will be presented, giving an insight into the Cu precipitation process and dissolution of precipitates under different annealing conditions.