Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.8: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

In situ micromechanical testing and local strain analysis of nanoporous gold — •Thomas Przybilla, Erich Thiess, Florian Niekiel, Benjamin Winter, Mirza Mačković, and Erdmann Spiecker — Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstrasse 6, 91058 Erlangen, Germany

Nanoporous gold (npg) acts as a model material to study mechanical size effects in nanostructured metals as the ligament size can be tailored within the nanometer to micrometer range. Au ligaments act together as a 3D open-porous network of interconnected nanostruts resulting in high mechanical strength under compression and nanoindentation. With decreasing ligament size stresses close to the theoretical shear strength were reported. In this work we study the mechanical behavior of npg foams with varying ligament diameter in the range of 10 to 100 nm by pillar compression experiments performed in situ via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). npg pillars are prepared by focused ion beam (FIB) milling and characterized by scanning transmission electron microscopy (STEM) tomography. Taking the porosity into account the yield stress is evaluated with respect to the ligament diameter. The local strain is mapped from in situ experiments by image correlation techniques revealing local strain gradients and showing a distinct difference between local and macroscopic yield strain values.