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Poisson’s ratio and fragility of bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

J.H. Na ,
E.S. Park ,
Y.C. Kim ,
E. Fleury ,
W.T. Kim  and
D.H. Kim
J.H. Na
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
E.S. Park
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
Y.C. Kim
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea; and Division of Materials Science and Engineering, Korea Institute of Science and Technology (KIST), Cheongryang, Seoul 130-136, Korea
E. Fleury
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea; and Division of Materials Science and Engineering, Korea Institute of Science and Technology (KIST), Cheongryang, Seoul 130-136, Korea
W.T. Kim
Affiliation:
Department of Physics, Chongju University, Chongju 360-764, Korea
D.H. Kim*
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
*
a) Address all correspondence to this author. e-mail:dohkim@yonsei.ac.kr
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Abstract

The correlation among apparent global plasticity, Poisson’s ratio, and fragility in monolithic bulk metallic glass (BMG) alloys has been investigated in the present study. The shear and bulk moduli in monolithic Cu-based BMG alloys have been measured by resonant ultrasound spectroscopy (RUS) and ultrasonic technique. The Cu43Zr43Al7Ag7 BMG alloy showing a large apparent global plasticity (∼8%) exhibits a high Poisson’s ratio when compared with that of Cu43Zr43Al7Be7 BMG alloy. In addition, the fragility of Cu-based BMG alloys can be obtained by differential scanning calorimetry (DSC). The fragility index m of Cu43Zr43Al7Ag7 BMG alloy is slightly larger than that of Cu43Zr43Al7Be7 BMG alloy. The correlation between Poisson’s ratio and fragility in BMG alloys can be presented by a simple relation of m − 17 = 14 (B∞/G∞ − 1). Poisson’s ratio and fragility might be regarded as an important parameter that controls global plasticity of glass-forming alloys.

Keywords

DuctilityAmorphousElastic properties

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Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 523 - 528
Copyright
Copyright © Materials Research Society 2007

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