Regensburg 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 13: Topical Session: Defects of Defects

MM 13.2: Vortrag

Dienstag, 18. März 2025, 14:30–14:45, H10

Hierarchy of defects in near-Σ5 tilt grain boundaries in copper studied by length-scale bridging electron microscopy — •Hui Ding¹, Anoosheh Akbari², Enze Chen³, Harald Rösner², Timofey Frolov⁴, Sergiy Divinski², Gerhard Wilde², and Christian H. Liebscher⁵ — ¹Max Planck Institute for Sustainable Materials, Düsseldorf, Germany — ²University of M\"unster, Institute of Materials Physics, Münster, Germany — ³Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA — ⁴{Materials Science Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA — ⁵Faculty of Physics and Astronomy, Ruhr University Bochum, Bochum, Germany

Grain boundaries (GBs) are material imperfections that significantly impact material properties. In this study, we utilized aberration-corrected scanning transmission electron microscopy to examine the structure of a series of near- Σ5(310)[001] tilt grain boundaries in copper. Globally, the GB appears flat with no noticeable defects. On the atomic-scale, however, various types of GB defects are observed. When a slight deviation in the misorientation is introduced, a patterning emerges featuring characteristic structural units from the Σ5 (310) [001] and Σ5 (210) [001] tilt boundaries. The structural landscape of the GB becomes more complex when GB plane inclination is also present, such as a wavy morphology or staircase-like architecture. Our investigation into GB structure, particularly its inherent defects, is a prerequisite towards gaining atomic-scale insights into their potential impact on material properties.

Keywords: Grain boundary; Scanning transmission electron microscopy; Strain; Copper