Regensburg 2025 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 14: Poster
KFM 14.8: Poster
Mittwoch, 19. März 2025, 17:00–18:30, P1
PALS of Hot-Rolled and Subsequently T4-Treated AlCuMgAg — •Lucian Mathes1, Leon Heinl2, Andreas Wagner3, Maik Butterling3, and Christoph Hugenschmidt1 — 1Heinz Maier-Leibnitz Zentrum, TU München — 2Institute of Casting Research, Montanuniversität Leoben, Austria — 3Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics
Positron annihilation lifetime spectroscopy (PALS) is a unique tool for studying the concentration and types of open-volume defects. We performed depth-resolved PALS to investigate such defects and the properties of precipitates in differently (heat) treated AlCuMgAg samples. Alloying AlCu with Ag has been shown to leverage the formation of the so-called Ω(Al2Cu) phase, known for its high strength and thermal stability. We present PALS measurements of Al-4Cu-0.3Mg-0.7Ag containing Ω phase precipitation after hot-rolling and subsequent T4-treatment. Our findings showcase the high thermal stability of the Ω phase and that positron annihilation studies help in understading and optimizing the process of strength hardening AlCuMgAg alloys.
Keywords: Positron annihilation spectroscopy; Positron lifetime; AlCuMgAg; Ω(Al2Cu) phase