Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Postersession I

MM 17.16: Poster

Montag, 16. März 2015, 18:00–20:00, Poster E

Impact of minor-alloying on the mechanical properties of Pd-based bulk metallic glasses — •Niklas Olschewski, Niklas Nollmann, Harald Rösner, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

Metallic glasses offer unique properties such as high strength, extended elasticity, high wear and corrosion resistance. However, the limited ductility and especially the immediate catastrophic failure in tension once the elastic limit is reached are major obstacles to applications as structural materials. This behavior has led to substantial effort towards understanding and improving the accommodation of plastic deformation in metallic glasses, including the design of composites consisting of glassy material surrounded by ductile crystallites. Our work has focused on the improvement of the ductility of bulk metallic glasses by adding minor alloying elements. In particular the impact of adding slight amounts of cobalt or iron (0.2 - 4 wt.%) to the well-known bulk glass-former Pd₄₀Ni₄₀P₂₀ on the mechanical properties has been studied.

The samples were produced by copper mold casting and their mechanical behavior was tested in compression and three-point bending tests. Further investigations (e.g. DSC, XRD, ultrasonic measurements, SEM) have been conducted to characterize the alloys’ properties. The obtained results are discussed.