Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 42: Mechanical Properties I
MM 42.7: Talk
Wednesday, March 18, 2015, 17:30–17:45, TC 010
Deformation mechanisms of nano-twinned Ag wires and Cu — •Aaron Kobler1,2, Thorsten Beuth1, Markus Moosmann1, Thomas Schimmel1, Horst Hahn1,2, and christian Kübel1,3 — 1Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — 2Technische Universität Darmstadt (TUD), Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany — 3Karlsruhe Nano Micro Facility (KNMF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Introducing nanotwins into the material is one possible approach to increase ductility and achieve high strength. However, the deformation mechanisms that govern the high strength and high ductility are still unresolved as twin boundaries can act as both barriers and sources for dislocations. For the materials strength, twin boundaries play a similar role as grain boundaries in ufg and nc metals, i.e. decreasing the twin spacing generally results in increased strength. We present Ag nanowires with twin planes parallel to the <112> wire axis. Using indentation experiments, we investigated the deformation mechanisms of individual nanowires. Further, we present in-situ tensile tests inside the TEM in combination with orientation mapping of nanotwinned Cu. In both cases we see a clear orientation dependent plastic deformation that we will analyze with respect to the underlying mechanisms.