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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Microstructure, Real Structure and Crystal Defects

KFM 17.2: Vortrag

Freitag, 20. März 2020, 09:50–10:10, TOE 317

The influence of trace element additions to Al-1.7 at.% Cu alloys: preservation of quenched-in vacancies and atomistic mechanisms supporting θ   ′ — •Torsten E.M. Staab¹, Frank Lotter¹, Uwe Mühle², Mohamed Elsayed³, Danny Petschke¹, Thomas Schubert⁴, Alaa M. Ibrahim³, Reinhard Krause-Rehberg³, and Bernd Kieback^2,4 — ¹University Wuerzburg, Dep. of Chemistry, LCTM, Roentgenring 11, D-97070 Wuerzburg, Germany — ²TU Dresden, Institute of Materials Science; Helmholtzstr. 7, D-01069 Dresden, Germany — ³Martin-Luther-University Halle-Wittenberg; Faculty of Natural Science II; von-Danckelmann-Platz 3; D-06120 Halle, Germany — ⁴Fraunhofer IFAM, Winterbergstrasse 28, D-01277 Dresden, Germany

Aluminium-copper alloys receive their strength during hardening by the formation of copper-rich precipitates. Their size, distribution and crystal structure are responsible for their mechanical properties. Adding small amounts of cadmium, indium or tin influences the precipitation behavior as well as the final strength of Al-Cu alloys. Quenched-in vacancies are bound to trace element atoms in the aluminium matrix. Thus, the diffusion behavior of the copper atoms is influenced. For high-purity ternary alloys we investigate the interaction of copper atoms and trace elements (In, Sn, and Pb) with quenched-in vacancies. Annealing the quenched alloys at elevated temperatures leads to finely distributed θ   ′- precipitates on the nanoscale.