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Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.12: Poster

Dienstag, 17. März 2020, 18:15–20:00, P4

Microstructural and mechanical investigation of magnetic impulse welds of Aluminium and Copper — •David Stein1, Maximilian Gnedel1, Sven Winter2, and Ferdinand Haider11Chair of Experimental Physics I, University of Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany) — 2Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik, IWU, Reichenhainer Straße 88, 09126 Chemnitz, Germany

Magnetic impulse welding (MPV) is one of the few methods that allows joining different kinds of metals with significantly differing melting temperatures. It is conducted by colliding two metal sheets at high velicities. A sound joint without embrittlement effects or the formation of critical amounts of intermetallic phases can be produced. The Al-Cu system is relevant for a variety of reasons. With the rise of electromobility, the need for cheap and light conductors like aluminum to be connected to copper is high. Furthermore, the results of the investigation of the joining mechanism between Al and Cu are relevant for systems like Al-Ti and Al-Fe, etc., whose welds are required for light-weight construction. The joining mechanisms of Al-Cu welds were mainly analyzed using scanning electron microscopy. The relevance of the occurring small amounts of intermetallic phases is determined by growing them via a heat treatment and comparing tensile testing results of heat treated and untreated welds. If a thin surface layer melts and resolidifies during the process, can be investigated with EBSD. With a variation of the process parameters the influence on the resulting microstructures and interfacial morphology has been studied.

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