Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 24: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 24.8: Vortrag

Mittwoch, 3. April 2019, 12:45–13:00, H45

Experimentally-Informed Large-Scale Atomistic Simulations of Nanoporous Gold — •Zhuocheng Xie¹, Julien Guénolé¹, Aruna Prakash¹, Thomas Przybilla², Erdmann Spiecker², and Erik Bitzek¹ — ¹Materials Science & Engineering, Institute I, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 5, 91058 Erlangen, Germany — ²Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 6, 91058 Erlangen, Germany

Nanoporous gold (NPG) is an ideal model system for the study of size effects at the nanoscale, since the ligament size can be precisely tailored within the nanometer to micrometer range. In this work, we study the deformation behavior of NPG using large-scale molecular dynamics simulations. We report on uniaxial compression tests using experimentally informed real-size atomistic samples, which are reconstructed from electron tomography datasets. By comparing the results of these simulations with simulations on geometrically constructed samples with average ligament size and porosity equal to the experimental samples, we study the influence of morphology and topology on the deformation behavior of NPG. The influence of surface-induced-stress on the critical resolved shear stress of NPG is evaluated by comparing the real-size samples and samples scaled-down by different factors. Additionally, the deformation mechanisms are studied in detail. The results provide qualitative insights in the fundamental deformation mechanisms not readily observable in in-situ mechanical tests.