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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.9: Poster

Dienstag, 17. März 2020, 18:15–20:00, P4

About the atomic structure of copper grain boundaries — •Lena Frommeyer, Christian H. Liebscher, and Gerhard Dehm — Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany

The atomic structures of grain boundaries (GBs) as interfaces between two crystals are determining microscopic and macroscopic properties of a material. So far, GBs were mostly studied by atomistic simulations and only few experimental studies exist, investigating pure high angle GBs on an atomic level. Recent studies of pure Σ19b [111] tilt GBs in copper showed that a GB can undergo phase transformations and different atomic structures can coexist, both in symmetric and asymmetric GBs. Furthermore, two symmetric variants of the Σ19b GB were observed, having different structural units. They also show a different behavior in compensating for inclinational deviations.
In this work, the same system is used, but a different GB, the Σ37c [111] tilt GB, is analyzed. As for the Σ19b GB, two different symmetric variants are observed and their atomic structures are studied by aberration-corrected transmission electron microscopy. Furthermore, asymmetric variants are investigated to analyze their behavior in compensating for deviations from the symmetric GB plane inclination. By comparing the results to the Σ19b GB, primary conclusions can be drawn whether structural units of symmetric GBs and their asymmetric variants are unique features of specific GBs or if the relation follows a generic concept.