Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region |
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Affiliation: | 1. IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany;2. Politehnica University of Timisoara, P-ta Victoriei 2, RO-300006 Timisoara, Romania;3. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (ÖAW), Jahnstraße 12, A-8700 Leoben, Austria;4. Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria |
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Abstract: | In the current research, the dynamic mechanical spectrum and compressive deformation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region (SLR) are investigated. The experimental results prove the existence of transition from Newtonian flow to non-Newtonian flow in the metallic glasses. In addition, we found that the characteristic stress σtc, which is obtained by a stretched exponential function based on the normalized viscosity, can be regarded as a transition point from Newtonian to non-Newtonian flow. The correlation between strain rate sensitivity exponent and corresponding strain rate was obtained at a certain temperature. It is noted that the variation of transition strain rate from Newtonian to non-Newtonian flow with different absolute temperatures follows the Arrhenius equation. The activation energy is in good accordance with that using the mechanical spectroscopy method. |
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Keywords: | Metallic glass Mechanical properties Superplasticity Viscosity Mechanical testing |
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