Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 29: Microstructure and Phase Transformations

MM 29.4: Talk

Wednesday, April 3, 2019, 15:45–16:00, H46

Mechanical dissolution of copper additions in aluminium by Friction Stir Processing — •Maximilian Gnedel¹, Amanda Zens², Ferdinand Haider¹, and Michael Friedrich Zaeh² — ¹Chair for Experimental Physics I, University of Augsburg, Universitätsstraße 2, 86159 Augsburg, Germany — ²Institute for Machine Tools and Industrial Management, Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany

Friction Stir Processing (FSP) is an established method for modifying properties in materials such as aluminium. Furthermore, the composition of the alloy can be changed by this technique. Intermixing specific micrometer-sized metal powders as well as metal foils helps to optimize both the microstructural stability during subsequent heat treatment, as well as the mechanical properties in general. Dispersing copper powder inside a matrix of AA1050 aluminium by FSP can produce a homogenous solid solution of the two elements, if suitable processing parameters are used. A substantial hardening effect is shown, due to both factors, refinement of the grain structure and solid solution hardening. By calculating the diffusion length and using the results of investigations based on energy-dispersive X-ray spectroscopy (EDS), it can be shown that the dissolution is mainly mechanically driven and not due to diffusion. Furthermore, transmission electron microscopy (TEM) provides insights on the formation of intermetallic phases during FSP, as well as after subsequent, targeted heat treatment. The results can be used in future studies to evaluate the properties of such highly deformed non-equilibrium alloys.