Materials Transactions Online

Materials Transactions, Vol.47 No.10 (2006) pp.2606-2609
© 2006 The Japan Institute of Metals

Ductile Metallic Glasses in Supercooled Martensitic Alloys

J. Das1,2,, K. B. Kim3, W. Xu1, B. C. Wei4, Z. F. Zhang5, W. H. Wang6, S. Yi7 and J. Eckert1,2

1FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany
2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Postfach 270016, D-01171 Dresden, Germany
3Department of Advanced Materials Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea
4Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
5Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
6Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
7Department of Materials Science and Metallurgy, Kyungpook National University, Daegu 702-701, Korea

We report ductile bulk metallic glasses based on martensitic alloys. The slowly cooled specimens contain a mixture of parent `austenite' and martensite phase. The slightly faster cooled bulk metallic glasses with 2–5 nm sized `austenite'-like crystalline cluster reveal high strength and large ductility (16%). Shear bands propagate in a slither mode in this spatially inhomogeneous glassy structure and undergo considerable `thickening' from 5–25 nm. A `stress induced displacive transformation' is proposed to be responsible for both plasticity and work-hardening-like behavior of these `M-Glasses'.

(Received 2006/6/7; Accepted 2006/8/31; Published 2006/10/15)

Keywords: Bulk metallic glass, solidification, mechanical properties, deformation, phase transformation

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