Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 16: Structural Materials

MM 16.7: Vortrag

Dienstag, 15. März 2011, 12:30–12:45, IFW D

In situ investigation of friction stir welded AA7449 using high energy SAXS — •Malte Blankenburg, Torben Fischer, Peter Staron, Luciano Bergmann, Jakob Hilgert, Jorge F. dos Santos, Martin Müller, and Andreas Schreyer — Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany

Friction stir welding (FSW) has in a very short time found a multitude of applications for high-tech applications in the transportation and energy industries. When engineering metallic materials are joined by friction stir welding, thermo-mechanical processes alter the base metal microstructure and properties. This induces the formation of non-equilibrium microstructures in the joint region, which are significantly different from those found in the base material. Such non-equilibrium phases can reduce strength and toughness of the material and are normally compensated by increasing the dimensions or design complexity of integral structures.

The intermediate stages of precipitation or phase transformations in the weld zone during the joining process can only be registered by in situ experiments. The transportable FSW system ’FlexiStir’ developed at HZG provides the opportunity to perform in situ small-angle X-ray scattering (SAXS) experiments during FSW. So far, FlexiStir was used at the HZG high energy synchrotron beamline HARWI II at HASYLAB. As a result, spatial resolved size and volume fraction distributions of precipitates in the heat affected zone during the FSW process were obtained.