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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 34.3: Talk

Wednesday, March 20, 2024, 10:45–11:00, C 230

The Defect Distribution in the Near-Surface Region in Al alloys Studied by Positron Annihilation Spectroscopy — •Lucian Mathes¹, Vassily Vadimovitch Burwitz¹, Adrian Langrehr¹, Christoph Springl¹, Bastian Veltel¹, Emma Huntley³, Andreas Wagner², Maik Butterling², Eric Hirschmann², Maciej Oskar Liedke², and Christoph Hugenschmidt¹ — ¹Heinz Maier-Leibnitz Zentrum (MLZ), TU München — ²Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics — ³Durham University

We have examined defects in pure and technical Al alloys on the atomic level using Positron Annihilation Spectroscopy. The influence of polishing (down to 40 nm OP-S) and heat treatment (T4 and T6) is explored in the near-surface region up to 6 μm in depth. We have determined the vacancy distribution by means of depth-resolved Doppler-broadening spectroscopy (DBS) using the slow positron beam at TUM. Further, we have characterized the defect type by depth-resolved Positron Annihilation Lifetime Spectroscopy (PALS) performed at the pulsed slow positron facility MePS at pELBE (HZDR).

Keywords: Positron Annihilation; Defect Spectroscopy; Aluminum Alloys