Dresden 2009 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: Poster Session II
MM 35.10: Poster
Wednesday, March 25, 2009, 16:30–18:30, P4
Preparation and characterisation of graphite particle reinforced Zr48Cu36Ag8Al8 BMG composites
— •Enrico Mund1, Jayamani Jayaraj2, Annett Gebert2, and Ludwig Schultz1,2 — 1TU Dresden, Helmholtzstr. 10, 01069 Dresden — 2IFW , Helmholtzstr. 20, 01069 Dresden
Bulk metallic glasses exhibit good mechanical properties such as high strength and high hardness. The deformation and fracture properties of BMGs are controlled by the initiation and propagation of shear bands. In order to improve further the mechanical properties, manipulation of the shear band propagation is eminent. By creating ex-situ particle reinforced BMG composites the fracture strength and plasticity can be increased. The particles can act as crack-stopper for the shear bands and become barriers for the shear band propagation.
In this work we use graphite particles due to their easy availability and designated properties. A way to fabricate graphite particle reinforced BMG is demonstrated for a selected ZrCuAgAl alloy with a high glass forming ability. Samples are characterised by various analyses methods in comparison to the monolithic BMG.
XRD, SEM and DSC examinations show the influence of the
graphite particles to the phase evolution upon casting and the thermal alloy behaviour. Compression tests are carried out to clarify the effect of different graphite particle volume fractions on the mechanical properties. Furthermore the influence of different particle size distributions on the mechanical properties is examined. An optimal relation between particle size and volume fraction for a reinforced BMG with increased plasticity will be proposed.