Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 24: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 24.6: Talk

Wednesday, April 3, 2019, 12:15–12:30, H45

Local Fatigue Behavior of Bimodal Copper Sheets Investigated by Dynamic Micropillar Compression — •Sebastian Krauß, Benoit Merle, and Mathias Göken — Friedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl Allgemeine Werkstoffeigenschaften (WW I), Erlangen, Germany

In contrast to macroscopic fatigue testing, fatigue experiments on local microsamples offer the opportunity to isolate the individual microstructural contributions from the global behavior of layered materials. In this study, Accumulative Roll Bonding (ARB) processed copper sheets with a bimodal microstructure were analyzed. Micropillars were fabricated by Focused Ion Beam (FIB) milling, yielding testing specimens positioned inside the individual layers of the material. Due to the bimodal microstructure, the microsamples from the different layers show varying grain sizes, which results in a change of the respective fatigue properties. Additionally, micropillars were prepared at the interface to study interface contributions to the fatigue behavior. The investigations were executed by a novel approach that combines dynamic nanoindentation and micropillar compression. With this technique the high cycle fatigue range is easily accessible for microscale samples. Observation of the underlying deformation processes was performed by SEM imaging as well as FIB cross-sectioning of the deformed samples.