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 (∈f) 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.
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This work was supported by the Global Research Laboratory Program of the Korean Ministry of Science. One of the authors (E.S. Park) was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-214-D00066). The author is indebted to Prof. Frans Spaepen, Harvard University for thoughtful advice.
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Park, E.S., Chang, H.J., Lee, J.Y. et al. Improvement of plasticity by tailoring combination of constituent elements in Ti-rich Ti−Zr−Be−Cu−Ni bulk metallic glasses. Journal of Materials Research 22, 3440–3447 (2007). https://doi.org/10.1557/JMR.2007.0424