Glass forming ability, thermodynamics and mechanical properties of novel Ti-Cu-Ni-Zr-Hf bulk metallic glasses

Novel, pentabasic Ti-Cu-Ni-Zr-Hf bulk metallic glasses (BMGs), with critical diameters of 2-4 mm, were successfully developed through the proportional mixing of the binary eutectic compositions of Ti27Cu73, Ti76Ni24, Zr76Ni24 and Hf84Ni16. According to the concept of binary eutectic units, five Ti-Cu-Ni-Zr-Hf BMGs were fabricated, of which the Ti29.44Cu46.72Ni7.88Zr7.6Hf8.4 alloy had the lower glass forming ability, and the smallest reduced ideal glass transition temperature delta and Delta C-p(m)/Delta S-m values, where Delta C-p(m) and Delta S-m represent the specific heat and entropy differences at the melting temperature (T-m), respectively. The Ti29.44Cu46.72Ni7.88Zr7.6Hf8.4 alloy also showed good mechanical properties, i.e., good plastic strain and relatively high compressive strength. (C) 2013 Elsevier Ltd. All rights reserved.