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Role of minor addition of metallic alloying elements in formation and properties of Cu–Ti-rich bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

E.S. Park ,
H.J. Chang ,
J.S. Kyeong  and
D.H. Kim
E.S. Park*
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
H.J. Chang
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
J.S. Kyeong
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
D.H. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Korea
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of minor addition (MA) of metallic alloying elements in Cu–Ti-rich Cu–Ti–Zr–Ni–Si bulk metallic glasses (BMGs) has been investigated. MA of elements having a relatively small positive enthalpy of mixing (partial substitution of Zr with Nb) leads to enhancement of compressive plasticity (up to about 5% of fracture strain) when the addition leads to improvement in glass-forming ability (GFA). If the GFA is reduced (partial substitution of Ni with Ag or Co), the plasticity is also reduced. On the one hand, the MA of elements having a relatively large positive enthalpy of mixing (partial substitution of Zr with Y) can lead to the liquid-state phase separation in Cu–Ti–Zr–Ni–Si(–Sn) BMGs, although the addition can lead to drastic deterioration in GFA and plasticity. This concept would be considered to be effective even in design of other BMG systems with tailored properties.

Keywords

AmphorousPhase transformationStructural
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1995 - 2002
Copyright
Copyright © Materials Research Society 2008

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