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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Microscopy, Tomography and Spectroscopy with X-ray Photons, Electrons, Ions and Positrons (joint session KFM/HL)

HL 29.7: Vortrag

Mittwoch, 3. April 2019, 11:50–12:10, H47

The influence of trace element additions to Al-1.7 at.% Cu alloys: preservation of quenched-in vacancies and atomistic mechanisms supporting θ   ′-formation — •Torsten E.M. Staab1, Frank Lotter1, Uwe Mühle2, Mohamed Elsayed3, Danny Petschke1, Thomas Schubert4, Reinhard Krause-Rehberg3, and Bernd Kieback2,41University Wuerzburg, Dep. of Chemistry, LCTM, Roentgenring 11, D-97070 Wuerzburg — 2TU Dresden, Institute of Materials Science; Helmholtzstr. 7, D-01069 Dresden — 3Martin-Luther-University Halle-Wittenberg; Faculty of Natural Science II; von-Danckelmann-Platz 3; D-06120 Halle — 4Fraunhofer IFAM, Winterbergstrasse 28, D-01277 Dresden

Aluminium-copper alloys of the 2xxx type receive their strength during hardening at room or elevated temperature by the formation of copper-rich precipitates. They are responsible for the final mechanical properties of these alloys. Alloying small amounts of Cd, In or Sn influences the precipitation behavior as well as the final strength of Al-Cu alloys. Obviously, quenched-in vacancies are bound to trace element atoms in the aluminium matrix. Thus, the diffusion behavior of the copper atoms is influenced and the main type of the formed precipitates changes. For high-purity ternary alloys we investigate the interaction of copper atoms and trace elements (In, Sn, and Pb) with quenched-in vacancies. By employing Differential Scanning Calorimetry (DSC), Small Angle X-Ray Scattering (SAXS), Positron Annihilation Lifetime Spectroscopy (PALS) as well as Transmission Electron Microscopy (TEM) we obtain a comprehensive picture.

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