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MM: Fachverband Metall- und Materialphysik
MM 35: Transport in Materials: Diffusion, Charge or Heat Conduction
MM 35.6: Vortrag
Freitag, 21. März 2025, 11:30–11:45, H22
Mechano-chemical coupling induced by Co grain boundary diffusion in SIGMA5(310) Cu bicrystals — •Esakkiraja Neelamegan1, Anoosheh Akbari1, Hui Ding2, Harald Rösner1, Daniel Gaertner1, Christian Liebscher2,3, Gerhard Wilde1, and Sergiy Divinski1 — 1Institute of Materials Physics, University of Münster, Münster-48149 Germany — 2Max-Planck-Institut für Sustainable Materials, Düsseldorf, Germany — 3Faculty of Physics and Astronomy, Ruhr University Bochum, Bochum, Germany
Grain boundary diffusion of 57Co in pure copper SIGMA-5(310)[001] bicrystals is investigated using the radiotracer technique. Experiments are conducted under both the type-B and type-C kinetics regimes, as classified by Harrison. By varying the amount of applied 57Co tracer solution, characteristic changes in the shape of the penetration profiles are observed and attributed to Co segregation induced changes of the grain boundary structure. The structural changes due to the Co addition are examined by scanning transmission electron microscopy. The elastic strains near the grain boundary are measured using nano-beam diffractions with a nanometer resolution. The Co-induced variations of the GB structure provide an intriguing picture, particularly when considering their influence on the diffusion behaviour in the presence of deliberately introduced solute atoms.
Keywords: Grain boundary diffusion; Scanning Transmission Electron Microscopy; Strain; Copper