Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Structural Materials II: Brazing and Welding

MM 34.2: Talk

Wednesday, March 18, 2015, 11:45–12:00, TC 010

Analysis of interface layers in dissimilar Al-Ti FSW-Joints — •Roland Marstatt¹, Markus Krutzlinger², Johannes Luderschmid¹, Robert Bartel¹, Michael F. Zäh², and Ferdinand Haider¹ — ¹Lehrstuhl fuer Experimentalphysik I, Universitaet Augsburg, Augsburg, Germany — ²Institut fuer Werkzeugmaschinen und Betriebswissenschaften (iwb), Technische Universitaet Muenchen, Garching, Germany

Friction Stir Welding (FSW) is a suitable technology to join dissimilar materials. In contrast to fusion welding processes the material does not exceed the solidus temperature during FSW. As a consequence FSW seems to be a good choice to form dissimilar joints as e.g. between aluminium and titanium alloys. Process optimization aims on the production of high quality dissimilar joints with a minimum of deleterious brittle 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 results of the formation of nano-scaled intermetallic layers at the bonding interface are presented. Therefore dissimilar joints of aluminium and titanium alloys, with lap as well as butt joint setups stirred only in aluminium, have been investigated under varying process conditions. The intermetallic layer plays a key role as joining mechanism - its thickness depends on process parameters and controls the static and dynamic mechanical properties of the joint. Understanding the relevant process parameters for the formation of this interlayer allows to control the joint quality.