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MM: Fachverband Metall- und Materialphysik
MM 27: Poster Session I
MM 27.5: Poster
Tuesday, March 13, 2018, 18:30–19:45, Poster E
Micro-mechanical behavior investigation of nanoporous gold: searching for the size of the structural unit — •Yijuan Wu1, Jürgen Markmann1,2, and Erica T Lilleodden1,2 — 1Institut für Werkstoffforschung, Werkstoffmechanik, Helmholtz-Zentrum Geesthacht, Geesthacht — 2Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg-Harburg, Hamburg
Microcompression testing of nanoporous gold (NPG) was carried out in order to investigate the effect of the ratio of deformation length-scale to microstructural length-scale. By varying both the micropillar diameter and the NPG ligament diameter, a critical ratio was found above which the test structure can be considered a representative volume of material resulting in reproducible stress-strain behavior and uniform deformation. This critical ratio was found to be independent of microstructural length-scale, suggesting self-similarity between the different samples. Below this critical ratio, stochastic behavior is observed along with non-uniform deformation and failure, suggesting incomplete load-bearing units.