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MM: Fachverband Metall- und Materialphysik
MM 43: Liquid and Amorphous Metals II - Mechanical properties
MM 43.3: Talk
Wednesday, April 2, 2014, 12:15–12:30, IFW A
Mechanical behaviour of CuZr-based bulk metallic glasses and composites — •Benjamin Escher1,2, Simon Pauly1, Ivan Kaban1,2, Uta Kühn1, and Jürgen Eckert1,2 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270116, 01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, 01062 Dresden, Germany
Compared to crystalline alloys, bulk metallic glasses (BMGs) exhibit yield strengths close to the theoretical limit. However, BMGs generally show a low or no plastic strain under either tensile or compressive stresses. This drawback has to be overcome for BMGs to be used as structural material.
The tolerance towards failure of CuZr-based BMGs can be significantly improved by the incorporation of structural heterogeneities such as crystals. The formation of such composites strongly depends on composition and cooling rate.
In the present work we investigated the mechanical properties of CuZr-based bulk metallic glasses and composites with different Al, Ag, Co and Sc additions. The effect of the elements on the thermal behaviour, the corresponding phase evolution and the resulting microstructure is correlated with the deformation behaviour.
It has been found, that the plasticity of the CuZr-X metallic glasses or composites can be significantly enhanced by the addition of proper quantities of the afore mentioned elements by changing the precipitating phase, its volume fraction and distribution.