Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.6: Poster

Dienstag, 8. März 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.