Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Experimental Characterization

MM 18.3: Talk

Monday, March 20, 2017, 18:15–18:30, BAR 205

Interface Nanolayer Analysis in Al-Cu FSW Lap Joints — •Roland Marstatt¹, Markus Krutzlinger², Johannes Luderschmid¹, Ferdinand Haider¹ und Michael F. Zaeh² — ¹Chair for Experimental Physics 1, University of Augsburg, Universitaetsstraße 1, 86159 Augsburg, Germany — ²Institute for Machine Tools and Industrial Management (iwb), Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany

Friction Stir Welding (FSW) is a suitable technology to join dissimilar materials. The material does not exceed the solidus temperature during FSW and the heat effect is much lower compared to fusion welding processes. So FSW can produce high quality joints between dissimilar metals with a minimum of deleterious intermetallic phases. Interfacial phases can cause embrittlement, but also lower the electrical and thermal conductivity through the interface. While intermetallic nanometer scaled layers in friction stir welded dissimilar metal joints were mentioned in literature, the quantitative understanding of the correlation of process parameters and interface structure is still a subject of research. In this study, the formation and atomic structure of the nanometer scaled intermetallic layers at the bonding interface of aluminium copper lap joints were analysed. These layers play a key role for the joining mechanism. The thickness of an intermetallic layer highly depends on the process temperature, which can be controlled by the welding parameters. The obtained results lead to a better understanding of the correlations and therefore enable process control and predictability. Supported by the DFG as part of SPP 1640.