Abstract
The i-relaxation of pre-annealed Zr55Cu30Ni5Al10 bulk metallic glasses (BMGs) was compared with that of as-cast Zr-based BMGs including Zr55Cu30Ni5Al10. The i-relaxation was investigated by volume relaxation. The relaxation behavior was well described by a stretched exponential relaxation function, � ðt Þ� exp½�ð t=¸iÞ ¢ i � , with the isothermal relaxation time, ¸i, and the Kohlrausch exponent, ¢i. The ¢i exhibited the strong temperature dependence for the pre-annealed BMG, while the weak temperature dependence was visualized for the as-cast BMG similar to the dynamic relaxation. The ¸i’s were modified by Moynihan and Narayanaswamy-Tool-Moynihan methods that reduce the difference in the thermal history of sample. As a result, the relaxation kinetics in the glass resembled that of a liquid deduced from the behavior of viscosity in the supercooled liquid. [doi:10.2320/matertrans.M2015023]
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