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MM: Fachverband Metall- und Materialphysik

MM 44: Mechanical properties III

MM 44.1: Talk

Friday, March 30, 2007, 12:30–12:45, H6

Improved plasticity in structurally inhomogeneous bulk metallic glasses — •J. Das¹, S. Pauly¹, K. B. Kim², S. Yi³, W. H. Wang⁴, and J. Eckert¹ — ¹IFW Dresden,Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany — ²Department of Advanced Materials Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea — ³Department of Materials Science and Metallurgy, Kyungpook National University, Daegu, 702-701, Korea — ⁴Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

To circumvent the limited ductility of bulk metallic glasses (BMGs), heterogeneous materials with glassy matrix and different type and length-scale of heterogeneities (micrometer-sized second phase particles or fibers, nanocrystals in a glassy matrix, phase separated regions, variations in short-range order by clustering) have been developed in order to control the mechanical properties. As example, recent results obtained for Cu- and Ti-base structurally inhomogeneous bulk metallic glasses will be presented. This type of clustered glasses is able to achieve high strength together with pronounced work hardening and large ductility by controlling the instabilities otherwise responsible for early failure. We emphasize the possibilities to manipulate such spatially inhomogeneous glassy structures based on martensitic alloys in favor of either strength and ductility, or a combination of both and also discuss the acquired ability to synthesize such "M-glasses" in bulk form through inexpensive processing routes.