Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Liquid and Amorphous Metals II

MM 35.1: Vortrag

Mittwoch, 24. März 2010, 11:30–11:45, H5

Effect of microstructure on the mechanical properties of metallic glasses — •Steffen Schmitz, Wolfgang Löser, and Bernd Büchner — IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany

Ordinary bulk metallic glasses (BMG) are characterized by high strength, but are usually very brittle. To combine high strength with some ductility, it is necessary to develop new concepts of alloy designing. Here phase separated metallic glasses are chosen, which involve binary terminal systems with both, negative and positive enthalpy of mixing, whereby the structure consists of two different amorphous phases or of nanocrystalline inclusions in an amorphous matrix. Rods and splats of the BMG model system Cu-Zr-Al with small additions of different elements (Gd, Co or Re) with positive enthalpy of mixing to one of the alloying elements are prepared. Their microstructure and glass forming ability (GFA) in dependence of the sample size are investigated and the consequences for mechanical properties are discussed. The GFA is increased by addition of Gd but reduced by addition of Co or Re. The mechanical properties of the Re containing alloys differ strongly from the other alloys investigated by having higher plastic strain at lower stress.