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

• Published in: Journal of non-crystalline solids 2012-12, Vol.358 (23), p.3200-3204
• Main Authors: Li, Peiyou, Wang, Gang, Ding, Ding, Shen, Jun
• Format: Article
• Language: English
• Subjects: Bulk metallic glass; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass forming ability; Glass transitions; Glasses (including metallic glasses); Materials science; Physics; Specific heat; Specific materials; Specific phase transitions; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermodynamics
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2012.08.005

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 4mm 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 (Trg), the γ value, the reduced ideal glass transition temperature (TK/Tm) (where TK is the ideal glass transition temperature) as well as the ratio between specific heat and entropy differences ΔCpm/ΔSm at the melting temperature (Tm). ► A new Ti-based BMG with critical diameter of 4mm is developed. ► GFA, δ and ΔCpm/ΔSm values are discussed based on the hole theory of liquid. ► Proportional modification of eutectic units cannot reduce GFA in the Ti-based alloy.