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MM: Fachverband Metall- und Materialphysik

MM 26: Poster Session

MM 26.2: Poster

Dienstag, 23. März 2010, 14:45–16:30, Poster C

Individual precipitates in Al alloys probed by the Bonn Positron Microprobe — Osman Balarisi¹, Patrick Eich¹, Matz Haaks¹, Sven-Martin Hühne², •Benedikt Klobes¹, Björn Korff¹, Werner Mader², Karl Maier¹, Reinhard Sottong¹, and Torsten Staab³ — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn — ²Institut für Anorganische Chemie , Römerstraße 164, 53117 Bonn — ³Fraunhofer ISC, Neunerplatz 2, 97082 Würzburg

Positron annihilation spectroscopy (PAS) is a unique tool for the charaterization of open-volume defects such as vacancies. Therefore, age hardenable Al alloys, whose decomposition is mainly driven by the vacancy mechanism of diffusion, are often charaterized by PAS techniques. Nevertheless, probing the defect state of individual precipitates grown in Al alloys requires a focused positron beam and has not been carried out up to now. In this respect we present the first investigations of the defect state of individual precipitates utilizing the Bonn Positron Microprobe (BPM). Furthermore, the analysis of the experimental data has to be facilitated by theoretical calculations of the observables of positron annihilation spectroscopy.