Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 74: Structural Materials (Steels, light-weight materials, high-temperature materials)

MM 74.1: Vortrag

Freitag, 16. März 2018, 11:15–11:30, H 0106

Structure and Properties of Al Alloys Produced 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) can be used to locally modify properties in materials such as aluminum. Furthermore, the composition of the alloy can be changed by this technique. Intermixing specific micrometer-sized metal powders helps to optimize both the microstructural stability during subsequent heat treatment, as well as the mechanical properties in general. This work provides insights into the properties of an AA1050 aluminum matrix with dispersed copper and iron particles added through FSP. The characteristics examined include the grain structure, the microhardness and the formation of intermetallic phases. Suitable processing parameters were found to produce homogenous aluminium samples containing spherical particles with an average diameter of several micrometers. X-Ray computed tomography examination confirmed a consistent distribution in the welding direction. Etching and electron microscopy investigation revealed a unique grain structure and intermetallic layers formed during the process, which yielded a remarkable change in microhardness in comparison to FSPed aluminium without additive particles. Future studies will help to understand the properties of such non-equilibrium alloys.