Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 2: Topical Session Nanoporous Functional Materials II

MM 2.1: Topical Talk

Montag, 23. März 2009, 12:00–12:30, IFW A

Plastic deformation of macroscopic nanoporous metals — •Hai-Jun Jin — Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Germany

Mechanical behavior of nanoporous metals reflects the collective deformation of extended arrays of nano-objects. Studies of their intrinsic mechanical properties have been prevented by high density of pre-formed cracks and thereby the severe brittleness of bulk nanoporous samples. This presentation will focus first on the strategies to fabricate macroscopic crack-free and high strength nanoporous metals, and then the experimental studies on the mechanical performance of monolithic and crack-free nanoporous gold samples. Millimeter-sized nanoporous gold samples can be prepared with excellent ductility in compression, enabling studies of the yield phenomenon and strain rate sensitivity along with the microstructure evolution. A distinguishing collective feature of deformation will be discussed in this material, in relation to its long range coherent crystal lattice at a scale much larger than the ligament size. (The following collaborations are acknowledged: D. Kramer, L. Kurmanaeva, Y. Ivanisenko, J. Weissmüller, INT, FZ Karlsruhe; J. Schmauch, Uni. Saarlandes; H. Rösner, Uni. Münster; DFG Forschergruppe 714 'Plastictiy of Nanocrystalline Solids')