Effect of local chemistry, structure and length scale of heterogeneities on the mechanical properties of a Ti₄₅Cu₄₀Ni_7.5Zr₅Sn_2.5 bulk metallic glass

Abstract

We report on distinct variations in local chemistry, structure and length scale of heterogeneous regions in Ti₄₅Cu₄₀Ni_7.5Zr₅Sn_2.5 fully glass rods of different diameters, i.e. rods subjected to different cooling rates. The present investigations indicate that the mechanical properties of the Ti₄₅Cu₄₀Ni_7.5Zr₅Sn_2.5 bulk metallic glass can be modified within a wide range of strength and plastic deformability by controlling the scale of the heterogeneous regions in the glass through appropriate variation of the cooling rate applied for solidification.

Acknowledgements

The work was supported by the Korean Ministry of Commerce, Industry and Energy for the development of structural metallic materials and parts with super strength and high performance, the faculty research fund of Sejong University in 2006 and the EU within the framework of the Research Training Network on ductile bulk metallic glass composites (MRTN-CT-2003-504692). This work was also supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (ROI-2007-000-10549-0).