Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Interfaces

MM 30.1: Talk

Wednesday, March 14, 2018, 10:15–10:30, H 0107

Tailoring the thickness of intermetallic interfacial nanolayers by temperature control of FSW in Al-Cu lap joints — •Roland Marstatt¹, Markus Krutzlinger², Johannes Luderschmid¹, Michael F. Zäh², and Ferdinand Haider¹ — ¹Chair for Experimental Physics 1, University of Augsburg, D-86159 Augsburg — ²Institute for Machine Tools and Industrial Management (iwb), Technical University of Munich, D-85748 Garching

The Friction Stir Welding (FSW) process is suitable to join dissimilar materials. The solidus temperature is not exceeded during FSW. Hence, joints between dissimilar metals can be produced with minimal intermetallic phase formation. The intermetallic phases can cause embrittlement and also lower the electrical and thermal conductivity across the interface. However, nano-scale intermetallic layers between joining partners have been reported in literature repeatedly, and these play a key role in material bonding. The layer thickness is related to welding temperature via an Arrhenius law. However, the correlation of the process parameters and the interface structure is still a subject of ongoing research. In this study, the potential of temperature control during FSW in order to improve the joint quality has been analyzed. The influence on and control over intermetallic layer thickness was investigated by welding dissimilar lap joints of aluminium and copper at different temperatures. The temperature was controlled by varying the rotational speed using a PI-controller. The results expand the existing knowledge and prove the applicability of temperature control during FSW of dissimilar metals. Supported by the DFG as part of SPP1640.