Regensburg 2000 – scientific programme

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M: Metallphysik

M 6: Struktur und Umwandlung II

M 6.7: Talk

Tuesday, March 28, 2000, 12:15–12:30, H16

The Al-Fe interface of friction-welded joints — •Dave Batchelor, Patrick Hoffmann, Dieter Schmeißer, Iulian Hulea, and Monica Brinza — BTU Cottbus, LS Angewandte Physik Sensorik, Erich-Weinert-Str. 1, 03046 Cottbus, Germany

The interface region of friction-welded joints Al-Fe samples is investigated by scanning Auger Spectroscopy, Electron Probe Micro-analysis (EPMA), X-ray Photoelectron spectroscopy, and Photoemission Electron Microscopy, performed at the synchrotron light source (BESSY). We investigated polished samples cut to obtain a cross-section of the Al-Fe joints. At the Al-Fe interface there is a small number of Fe teeth protuding into the adjacent Al-matrix. Beside this mechanical interlock mechanism we identify an Fe-Al alloy which is formed in an almost homogeneous interface layer of approximately 80 micron thickness. We determine the valence band spectra within that layer and notice that the alloying formation is limited to the interface region. In addition, the profile of both, the Fe and O distribution within the Al next to that interface is determined. A model of the friction-welding mechanism is derived and discussed in terms of the ability of achieving low temperature Fe-Al joints.