Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 24: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 24.7: Vortrag
Mittwoch, 3. April 2019, 12:30–12:45, H45
Mechanical properties of nanoporous gold studied by scale-bridging in situ testing, non-destructive 3D analyses and experimentally-informed simulations — •Thomas Przybilla1, Erich Thiess1, Florian Niekiel1, Benjamin Apeleo Zubiri1, Mirza Mačković1, Peter Schweizer1, Zhuocheng Xie2, Julien Guénolé2, Arun Prakash2, Stephen T. Kelly3, Hrishikesh A. Bale3, Erik Bitzek2, and Erdmann Spiecker1 — 1IMN, FAU, Erlangen, Germany — 2WW 1, FAU, Erlangen, Germany — 3Carl Zeiss X-ray Microscopy, Pleasanton, USA
The objective of this study is to understand the interplay between the size of single struts, the network topology/morphology and the defect structure in nanoporous gold (npg). The aim is realized by combining in situ micromechanical testing with non-destructive tomographic techniques and experimentally-informed simulations. Micropillar compression is performed in scanning electron microscopy and transmission electron microscopy. For small strut sizes, 360° electron tomography is applied enabling high quality reconstructions of the npg network. The experimentally derived 3D data are used as input for large-scale atomistic simulations and compared with simulations on geometrically constructed structures. This approach allows the correlation of experimental and simulated flow stress, the explanation of defect mechanisms observed in the experiment and the study of different topology and boundary conditions. For larger strut sizes analyses are carried out by high-resolution X-ray tomography and experimentally-informed finite element simulations correspondingly.