High-Pressure Annealing Effect on Glass Transformation Temperature of Zr41Ti14Cu12.5Ni10Be22.5 Bulk Metallic Glass

Zr41 Ti14 Cu12.5Ni10Be22.5 bulk metallic glasses （BMG） are annealed at a temperature of 603 K under ambient and high pressures in the range of 3-6 GPa. The effect of high pressure annealing on the nanocrystallization process of compressed specimens is investigated by x-ray diffraction, differential scanning calorimetry and transmission electron microscopy. Experimental results show that the grain size of the crystalline phase decreases with the increasing pressure. For the Zr41Ti14Cu12.5Nil0Be22.5 BMG annealing at 603K in the pressure range of 0- 6 GPa, the activation energy 159.68 kJ/mol and the activation volume △V＊ =0.94 cm^3/mol are determined. The mechanism for the effects of the high pressure on the nanocrystallization process of the BMG is discussed.