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MM: Fachverband Metall- und Materialphysik

MM 26: Interface Controlled Properties and Nanomaterials: Grain Boundaries and Stability, Spectroscopy and Interatomic Potentials

MM 26.3: Talk

Wednesday, March 29, 2023, 10:45–11:00, SCH A 216

Influence of precipitates during anodization of aluminum alloys studied by TEM at cryogenic temperatures — •Lydia Daum, Stefan Ostendorp, Martin Peterlechner, and Gerhard Wilde — Westfälische-Wilhelms-Universität, Münster, Germany

Aluminum alloys with predefined alloying elements are chosen regarding their performance in certain areas of industrial applications due to their hardness, strength and corrosion resistance. Precipitates such as Mg2Si and dispersoids, e.g. enrichments of Mn in EN * AW6xxx alloys hinders the formation of ordered anodic aluminum oxides (AAOs) as achievable using high-purity aluminum samples.

The focus of this work is on correlating the structural and chemical properties of precipitates within AAOs and at the interface to the alloy. Due to geometry and size of the precipitates, transmission electron microscopy (TEM) is performed at selected areas. Measuring the same properties inside an Al 6xxx alloy close to the interface provides information about the contribution of the segregations during anodization. Previous scanning transmission electron microscopy (STEM) studies have shown that cryogenic temperatures can partially reduce the beam damage in electron beam sensitive materials as organics or AAOs [1]. In this study, the sample is also characterized by nanobeam diffraction pattern analysis and electron dispersive X-ray spectroscopy at cryogenic temperatures.

[1] A. M. Jasim, X. He, Y. Xing, T. A. White, and M. J. Young. ACS Omega 6.13 (2021), 8986-9000.