Abstract: The typical Cu50Zr50 and Cu60Zr40 binary metallic glasses ribbons were taken as object of this study, the effects of stress and temperature on uniaxial tensile creep at temperature close to the Tg (glass transition temperature) were studied systematically via dynamic mechanical analyzer (DMA). The Tg was measured by differential scanning calorimeter (DSC) and DMA at the same heating rate, respectively. The apparent activation energies for the creep of Cu50Zr50 and Cu60Zr40 were obtained from Arrhenius equation, which were 5.3 eV and 6.2 eV, respectively. This indicates that the tensile creep deformation of Cu-Zr metallic glasses is related to the glass transition (α-relaxation) behavior. Further calculation showed that creep stress exponent (n) decreasesd with the increasing temperature and was finally close to 1, which demonstrated Cu50Zr50 and Cu60Zr40 metallic glasses tend to be Newtonian viscous flow when they approach to glass transition stage.
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2018, Vol. 32 
