Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.24: Poster
Dienstag, 19. März 2024, 17:00–19:00, Poster B
Exploring the atomic structure of Σ5 GBs in copper — •Hui Ding1, Esakkiraja Neelamegan2, Anoosheh Akbari2, Sergiy Divinski2, Gerhard Wilde2, and Christian Liebscher1 — 1Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany — 2University of Münster, Münster, Germany
Grain boundaries (GBs) are material imperfections that have a strong influence on material properties. They can act as preferred diffusion pathways for solutes and hence impact the atomic transport properties of polycrystalline materials.
However, the relation between the atomic structure of GBs, possible deviations from the ideal structure, and their transport properties often remains unexplored. In this study, we employ aberration-corrected scanning transmission electron microscopy as a first step to characterize the atomic structure of a series of near-Σ5 (310) [001] symmetric tilt GBs.
While the kite-shaped structural units can be well-recognized in the Σ5 (310) [001] symmetric GBs, they also exhibit various defects, such as disconnections, asymmetric nanofacets, and secondary dislocations. These variations of the GB structure present an intriguing picture, particularly when considering their potential influence on the diffusion behaviour in the presence of deliberately introduced solutes. We will discuss the evolution of GB structure, the formation of GB defects and address their role on the kinetic properties of interfaces.
Keywords: Grain boundary; diffusion; scanning transmission electron microscopy; nanofacets; disconnection