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Design of a bulk amorphous alloy containing Cu–Zr with simultaneous improvement in glass-forming ability and plasticity

Published online by Cambridge University Press:  03 March 2011

Seok-Woo Lee ,
Sang-Chul Lee ,
Yu-Chan Kim ,
E. Fleury  and
Jae-Chul Lee
Seok-Woo Lee
Affiliation:
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Sang-Chul Lee
Affiliation:
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Yu-Chan Kim
Affiliation:
Advanced Metals Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
E. Fleury
Affiliation:
Advanced Metals Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
Jae-Chul Lee*
Affiliation:
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

We synthesized bulk amorphous alloy systems of Cu43Zr43Al7X7 (X = Be, Ag; numbers indicate at.%), with the objective of simultaneously enhancing the glass-forming ability (GFA) and the plasticity. The alloys not only exhibit high plasticity (∼7%, ∼8%), but also possess enhanced GFA (alloys with 12 and 8 mm diameter). The possible mechanisms underlying this enhanced GFA and plasticity exhibited by these alloys are discussed based on the atomic-packing state and atomistic-scale compositional separation associated with the mixing enthalpy difference. A strategy for designing bulk amorphous alloys with simultaneous improvement in the GFA and the plasticity is proposed from the viewpoint of atomic-packing state and atomistic-scale phase separation.

Keywords

AmorphousDuctilityScanning transmission electron microscopy (STEM)
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 486 - 492
Copyright
Copyright © Materials Research Society 2007

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