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MM: Fachverband Metall- und Materialphysik

MM 8: Microstructure and Phase Transformations - Processing

MM 8.2: Vortrag

Montag, 16. März 2020, 12:00–12:15, IFW B

Dissolution of copper additions in aluminium by Friction Stir Processing — •Maximilian Gnedel¹, Amanda Zens², Ferdinand Haider¹, and Michael Friedrich Zäh² — ¹Chair for Experimental Physics I, Universitätsstraße 1, 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 to modify the properties of 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 with different morphologies 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 factors such as refinement of the grain structure, solid solution hardening and formation of early stage Al-Cu precipitates. By comparing the particle size distributions before and after FSP and including insights provided by transmission electron microscopy of the Al-Cu interface, a coherent understanding of the alloying process, a complex interplay between diffusion driven dissolution and mechanical fragmentation, can be obtained. The results can be used in future studies to evaluate the properties of such non-equilibrium alloys combined with the unique microstructure produced by FSP.