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MM: Fachverband Metall- und Materialphysik

MM 34: Mechanical Properties and Alloy Design: e.g. Light-Weight, High-Temperature, Multicomponent Materials II

MM 34.2: Talk

Wednesday, March 20, 2024, 10:30–10:45, C 230

Investigation of Age-Hardened AlCu Alloys with Coincidence Doppler Broadening Spectroscopy — •Leon Chryssos and Christoph Hugenschmidt — Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748 Garching, Germany

The positron in matter acts as a defect sensitive probe. Coincidence Doppler Broadening Spectroscopy (CDBS) is sensitive to open volume defects and to the elemental signature at the positron annihilation site. In contrast to other positron annihilation techniques, this enables the analysis of vacancy-solute complexes in solids and precipitates in the host matrix. In age-hardened AlCu alloys Cu-rich clusters are responsible for a significant improvement of the strength of the material. In this presentation, CDBS was used to investigate the Cu cluster formation in such alloys, especially after solution annealing and quenching. Combined with our new analysis software and ab-initio calculations this gives detailed insights into the studied materials.

Keywords: Alloys; Positrons