Abstract
We have investigated the viscosity of the supercooled liquids over a wide range of strain rate by constant-strain-rate tensile tests for La 55Al 25Ni 20, Zr 65Al 10Ni 10Cu 15 and Pd 40Cu 40P 20 (at.%) metallic glasses. The supercooled liquids exhibited Newtonian viscosity (equilibrium state) that transferred to a non-Newtonian viscosity (non-equilibrium state) with increasing temperature. The critical strain rate of the Newtonian viscosity increased with increasing temperature in accordance with the Arrhenius relation. The strain rate dependence of viscosity was described well with a master curve expressed by a stretched exponential function η/η 0=1− exp(C/ ε ̇ β) . The Newtonian viscosity was successfully described with the free-volume model of Cohen and Grest. The fragility of the Newtonian viscosity revealed that the supercooled liquids of the metallic glasses were classified into the relatively strong liquids such as Ge 10As 10Se 80, B 2O 3 and Na 2O–2SiO 2 glass formers.
Published Version
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