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MM: Fachverband Metall- und Materialphysik
MM 26: Poster session II
MM 26.6: Poster
Tuesday, March 8, 2016, 18:30–20:30, Poster B3
Deformation behavior and solid solution strengthening of metallic micro- and nanoparticles studied by in situ electron microscopy — •Patrick Herre1, Stefan Romeis1, Jonas Paul1, Mirza Mačković2, Florian Niekiel2, Simon M. Kraschewski2, Erdmann Spiecker2, and Wolfgang Peukert1 — 1Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 2Institute of Micro- and Nanostructure Research (IMN), Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
The small scale deformation behavior of (sub-) micron particles and structures is fairly distinct from the bulk due to internal and external interfaces as the size dimensions are close to the characteristic length scale (e.g. dislocation spacing) of the underlying physical (deformation) mechanism. In order to deepen the current understanding of small scale mechanics, metallic particles of defined size, morphology, structure and composition are synthesized by liquid and solid state dewetting of thin metallic films on ceramic substrates. As a model and reference system, thin Au films are dewetted on (0001) sapphire substrates. Hence, single-crystalline and defect-free Au particles of defined shape and orientation with respect to the substrate are obtained and depict an ideal specimen for decent mechanical testing. In addition, thin films composed of pure Ni as well as Ni-rich solid solutions of Ni-Ta and Ni-W are prepared via electron beam PVD on sapphire substrates. In situ electron microscopy is used as a powerful tool for conducting deformation experiments of adequate image and data resolution.