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

The quaternary Ti-Cu-Ni-Zr bulk metallic glasses are developed through proportionally mixing of the binary eutectic phases of Ti27Cu73, Ti76Ni24, Zr38Cu62 and Zr76Ni24. 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 quatemary alloys correlate well with the reduced glass transition temperature (T-rg), the gamma 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 Delta C-p(m)/Delta S-m at the melting temperature (T-m). (C) 2012 Elsevier B.V. All rights reserved.