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MM: Fachverband Metall- und Materialphysik

MM 38: Structural materials

MM 38.6: Vortrag

Mittwoch, 2. April 2014, 11:30–11:45, IFW B

Structural analysis of dissimilar Al-Ti FSW joints — •Roland Marstatt¹, Markus Krutzlinger², Maximilian Gnedel¹, Ferdinand Haider¹, and Michael F. Zaeh² — 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 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 titanium alloys. However, a comprehensive description of the effective joining mechanisms of friction stir welded dissimilar material joints - formation of metallic bonds vs. interlocking mechanisms - is still a subject of research.

In this study first results of the analysis of the effects on the structure of the weld seam caused by stirring material flow are presented. FSW-joints of aluminium and titanium alloys in lap joint configuration have been investigated under varying process conditions. The results seem to show a transport of Ti into Al, which leads to considerable solid solution hardening close to the weld seam. But until now, no indication for the formation of brittle intermetallic phases has been found. Furthermore, the thermal stability of the joint with possible formation of intermetallic phases and subsequent embrittlement was studied.