Regensburg 2016 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 60: Microstructure and Phase Transformations III

MM 60.5: Talk

Thursday, March 10, 2016, 16:45–17:00, H39

Formation of interface layers in dissimilar Al-Cu FSW-Joints — •Roland Marstatt¹, Markus Krutzlinger², Johannes Luderschmid¹, Ferdinand Haider¹, and Michael F. Zaeh² — ¹Lehrstuhl fuer Experimentalphysik I, Universitaet Augsburg, Germany — ²Institut fuer Werkzeugmaschinen und Betriebswissenschaften, Technical University of Munich, Garching, Germany

Friction Stir Welding (FSW) is a suitable technology to join dissimilar materials, in contrast to fusion welding processes without exceeding the solidus temperature. As a consequence, high quality joints can be produced with a minimum of deleterious intermetallic phases. Due to the process conditions, FSW seems to be a good choice to form dissimilar joints as e.g. between aluminium and copper. Process optimization aims on high quality dissimilar joints with a minimum of deleterious intermetallic phases. But still an intermetallic layer at the bonding interface is detected. However, a comprehensive description of the effective joining mechanisms is still a subject of ongoing research.

In this study the analysis of the formation of nano-scaled intermetallic layers at the bonding interface is presented. These layers play a key role for the joining mechanism and influence mechanical properties and conductivity. Therefore, dissimilar lap joints of aluminium and copper with the pin stirring in aluminium only have been investigated. The thickness of the intermetallic layer highly depends on the process temperature which varies with different process parameters. Understanding the relevant process parameters for the formation of the interlayer allows to control the joint quality. Supported by the DFG (SPP1640).