Dresden 2003 – wissenschaftliches Programm
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M: Metallphysik
M 27: Nanoskalige Materialien II
M 27.2: Vortrag
Dienstag, 25. März 2003, 16:45–17:00, IFW D
Mechanical Properties of nanocrystalline metals and coatings — •Johannes Mueller1, Rolf Hempelmann2, Harald Natter2, and Mathias Göken3 — 1Grundlagen der Werkstoffwissenschaften /Methodik, Universität des Saarlandes — 2Physikalische Chemie, Universität des Saarlandes — 3Institut für Werkstoffwissenschaften, Universität Erlangen-Nürnberg
The mechanical properties of different nanocrystalline metals (Al, Ni) were investigated with a nanoindenting atomic force microscope. Brass wires with a diameter of 1 mm were coated in a pulsed electrodeposition process with nanocrystalline nickel with a coating thickness of 5 Mikrometer. Cross sections were prepared from these wires to investigate the mechanical properties and microstructure. The coatings were characterised in an atomic force microscope to determine the film thickness and grain size. The mechanical properties were determined by nanoindentations with a maximum load of 1 mN. The mechanical properties of the coating and the substrate are well distinguishable. Moreover differences in hardness and Young’s modulus of different specimens are detectable in a reproducible way. The properties of nanocrystalline nickel coatings with grain size between 20 nm and 100 nm are compared with corresponding bulk materials and with polycrystalline materials.