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Deformation behavior of Zr–Al–Cu–Ni–Sn metallic glasses

Published online by Cambridge University Press:  01 May 2006

D.H. Bae*
Affiliation:
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
S.W. Lee
Affiliation:
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
J.W. Kwon
Affiliation:
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
S. Yi
Affiliation:
Department of Materials Science and Metallurgy, Kyungpook National University, Daegu 702-701, Korea
J.S. Park
Affiliation:
Center for Non-Crystalline Materials, Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A highly deformable Zr–Al–Cu–Ni–Sn alloy system without any catastrophic failure has been developed and the underling mechanism for exceptional plasticity has been investigated in terms of structural characteristics and atomic movement kinetics. The as-cast Zr61.7Al8Ni13Cu17Sn0.3 bulk metallic glass has many local nanoscale ordering features. They can play a critical role in nucleating abundant shear bands that sufficiently accommodate global plasticity. During deformation at room temperature, the ordered regions do not grow, providing a structural stability, possibly from the sluggish atomic movement kinetics. Thermal activation energy for crystallization of the Zr61.7Al8Ni13Cu17Sn0.3 alloy is estimated as 3.96 eV, which is about 2.8 times higher than that of the Z41.2Ti13.8Cu12.5Ni10Be22.5 alloy [Vitreloy 1 (Vit1)] and the dynamic mass flow rate is around 10 times slower than that of Vit1. A thermomechanical estimation of compressive strain rates under constant stress shows a sluggish atomic movement upon the addition of Sn.

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Articles
Copyright
Copyright © Materials Research Society 2006

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