Glass forming ability and thermodynamics of new Ti-Cu-Ni-Zr bulk metallic glasses

Abstract The quaternary Ti-Cu-Ni-Zr bulk metallic glasses are developed through proportionally mixing of the binary eutectic phases of Ti 27 Cu 73 , Ti 76 Ni 24 , Zr 38 Cu 62 and Zr 76 Ni 24 . The novel Ti-Cu-based bulk metallic glasses with the critical diameter of 4 mm are successfully developed by the modification of the proportion of these eutectic units. The different glass forming ability (GFA) is discussed in a frame of thermodynamics. The GFA of these quaternary alloys correlate well with the reduced glass transition temperature ( T rg ), the γ value, the reduced ideal glass transition temperature ( T K / T m ) (where T K is the ideal glass transition temperature) as well as the ratio between specific heat and entropy differences ΔC p m / ΔS m at the melting temperature ( T m ).