Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 52: Nanomaterials III: Nanoporous Gold and Phase Transformations

MM 52.3: Vortrag

Donnerstag, 19. März 2015, 12:15–12:30, H 0106

Investigation of the coarsening behaviour of nanoporous gold based on representative volumes — Kaixiong Hu¹, •Markus Ziehmer¹, Ke Wang², and Erica Lilleodden¹ — ¹Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Geesthacht, Germany — ²Hamburg University of Technology, Institute of Materials Physics and Technology, Hamburg, Germany

Advances in 3D analyses by electron microscopy enable the detailed investigation of material systems exhibiting complex microstructures, such as nanoporous gold (npg). This in turn allows access to critical structural parameters needed to advance our understanding of material behaviour. In particular, the coarsening of the 3D bicontinuous pore-ligament network of npg is one problem, where 3D analysis helps to explore the applicability of scaling laws in mechanical behaviour, which implicitly assume structural self-similarity across varying length-scales. However, reliable answers require a careful identification of representative volumes, which mimic the characteristics of the global microstructure. We present an investigation on thermally induced coarsening of npg based on focused ion beam tomography. The presentation highlights the importance of properly identifying representative volumes for this type of material system. Results on crucial microstructure parameters like ligament size, surface curvature and network connectivity are shown, which seem to support the view of structural self-similar evolution of npg.