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.
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This work was supported by the Global Research Laboratory Program of the Korean Ministry of Science. E.S. Park was supported by a Korea Research Foundation Grant funded by the Korean Government (MOEHRD; grant KRF-2006-214-D00066). The authors are indebted to Prof. Frans Spaepen, Harvard University, for thoughtful advice.
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Park, E., Chang, H., Kyeong, J. et al. Role of minor addition of metallic alloying elements in formation and properties of Cu–Ti-rich bulk metallic glasses. Journal of Materials Research 23, 1995–2002 (2008). https://doi.org/10.1557/JMR.2008.0246