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Kinematic Viscosity ofMulticomponent FeCuNbSiB-BasedMelts
Yuri N Starodubtsev1,2, Vladimir S Tsepelev1, Nadezhda P Tsepeleva1
1Research Center for Physics of Metal Liquids, Ural Federal University, Mira Str. 19, 620002 Ekaterinburg, Russia.
Nanomaterials (Basel, Switzerland)
|April 30, 2021
Summary
This study reveals a universal linear relationship in nanocrystalline soft magnetic alloy melts, linking activation energy to pre-exponential factors. Viscosity is inversely related to cluster size, indicating structural transitions during flow.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Understanding the temperature dependence of viscosity in multicomponent melts is crucial for materials processing.
- Nanocrystalline soft magnetic alloys exhibit complex rheological behaviors influenced by their unique structures.
Purpose of the Study:
- To investigate the temperature dependences of kinematic viscosity in multicomponent melts of nanocrystalline soft magnetic alloys.
- To explore the relationship between activation energy, pre-exponential factor, and cluster size in these melts.
- To interpret anomalies in viscosity-temperature dependence as potential liquid-liquid structural transitions.
Main Methods:
- Measurement of kinematic viscosity at various temperatures.
- Analysis of temperature-dependent viscosity data using the Arrhenius equation.
- Calculation of reduced activation energy (E·(RT)⁻¹) and pre-exponential factor (ν₀).
- Correlation of rheological parameters with estimated cluster sizes.
Main Results:
- A universal linear relationship was identified between the reduced activation energy and the pre-exponential factor for melts following Arrhenius behavior.
- Activation energy of viscous flow showed a linear correlation with the natural logarithm of cluster size.
- Melt viscosity was found to increase as cluster size decreased.
Conclusions:
- The observed linear ratio between activation energy and pre-exponential factor is a universal characteristic for Arrhenius-type temperature dependencies.
- Changes in the Arrhenius plot indicate a liquid-liquid structural transition involving cluster disintegration and reformation.
- Cluster size is a critical factor influencing the viscous behavior and structural transitions in these magnetic alloy melts.
Keywords:
Arrhenius equationactivation energykinematic viscosityliquid metalliquid multicomponent alloyliquid–liquid structure transitionMore Related Videos
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