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Improvement of plasticity by tailoring combination of constituent elements in Ti-rich Ti–Zr–Be–Cu–Ni bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

E.S. Park ,
H.J. Chang ,
J.Y. Lee  and
D.H. Kim
E.S. Park*
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
H.J. Chang
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
J.Y. Lee
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, 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: espark@deas.harvard.edu
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Abstract

The effect of replacement of Ti with Y or Nb in Ti-rich Ti–Zr–Be–Cu–Ni bulk metallic glasses (BMGs) has been investigated. The minor addition (MA) of Y (Y–Ti: +58 kJ/mol) induced phase separation into Y-rich crystalline particles and Ti-rich amorphous matrix, while the MA of Nb (Nb–Ti: +10 kJ/mol) led to nanocrystallization in Ti-rich BMGs with icosahedral nuclei. This result indicates that MA of elements having positive enthalpy of mixing can induce a different degree of instability in the single amorphous matrix depending on the amount of repulsive interaction energy. In particular, MA of Nb (up to 4 at.%) significantly increased the compressive fracture strain (ϵf) up to ∼9.35 ± 0.2%, which indicates that the plasticity of BMGs can be enhanced by the size-modulated icosahedral phase embedded in the amorphous matrix.

Keywords

AmorphousNanostructureDuctility
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 12 , December 2007 , pp. 3440 - 3447
Copyright
Copyright © Materials Research Society 2007

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