Dresden 2014 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Topical Session: Nanomechanics of nanostructured materials and systems IV - Tribology/Composites
MM 20.4: Talk
Tuesday, April 1, 2014, 11:15–11:30, IFW A
3D microstructure characterization of nanoporous gold/epoxy composites — •Kaixiong Hu1, Ke Wang2, Daniel Kupka1, Markus Ziehmer1, and Erica Lilleodden1 — 1Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht — 2Institute of Materials Physics and Technology, Hamburg University of Technology
Nanoporous gold displays tunable mechanical behavior through the variation of internal length-scales, but it is severely limited by its lack of ductility in tension. By infiltrating the porous structure with epoxy, a composite material with tensile ductility and enhanced flow stress is achieved. Importantly, the infiltration of epoxy offers an advantage for 3D tomographic analysis by allowing "clean" cross sectioning with a focused ion beam. The resultant 3D reconstructions can be used to quantify characteristic structural parameters, and as direct input for finite element simulations of deformation. This, in turn, allows an improved description of the structure-property relations controlling this unique material. In the presented work, we have carried out a study of the micromechanical investigation of the nanoporous gold-epoxy composite using nanoindentation-based testing methods and finite element simulations, along with 3D tomographic characterization of the undeformed and deformed material. Results reveal how the 3D microstructure of the composite influences its mechanical behavior, and are discussed in terms of size-dependent plasticity and classical scaling laws for porous materials.