Improvement of glass-forming ability and phase separation in Cu–Ti-rich Cu–Ti–Zr–Ni–Si bulk metallic glasses

Present study reports improvement of glass-forming ability (GFA) and phase separation in Cu–Ti-rich Cu–Ti–Zr–Ni–Si bulk metallic glasses (BMGs) by tailoring the constituent elements. The MA of metalloid element, Sn having relatively large negative enthalpy of mixing can lead to improve GFA (up to 8 mm in diameter) as well as thermal stability (up to ΔTx = 48 K) by optimizing the substitution element. And the addition of elements having relatively large positive enthalpy of mixing (partial substitution of Zr or Ti with Y) can lead to the liquid state phase separation in Cu–Ti–Sn–Zr–Ni–Si BMG, although the addition lead to drastic deterioration of the GFA.