Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.78: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Kinetic processes in copper bi- and tricrystals — •Isabelle Binkowski1, Henning Edelhoff1, Jörn Leuthold1, Matthias Wegner1, Martin Peterlechner1, Shashank Shekhar2, Alexander King3, Sergiy Divinski1, and Gerhard Wilde1 — 1Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany — 2Indian Institute of Technology Kanpur Kalyanpur, Kanpur - 208 016 — 3The Ames Laboratory, 311 TASF, Iowa State University Ames, IA 50011-3020
Grain boundaries (GBs) and their junctions often define properties of polycrystals and have an influence on diffusion and plastic behavior. Because of the high density of GBs included in polycrystalline materials and especially nanocrystalline materials, investigation of kinetic processes in this type of defect are of fundamental interest. Heading towards nanostructured materials one has to focus also on triple junctions (TJs) since their volume fraction and correlative their influence on materials' properties rise. In the present investigation, a near special Σ(5):Σ(5):Σ(25) copper tricrystal is utilized to examine the properties of a TJ with defined orientation of grains and misorientation across the GBs. The mass transport properties of the tricrystal are investigated using the radiotracer method. The kinetics of out-diffusion from the TJ into the neighboring GBs are measured by preparing proper bicrystalline samples. Additionally, tensile tests including plastic deformation of several percent are performed and the digital image correlation technique is applied to measure the strain fields in the immediate vicinity of GBs and TJs.