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Viscosity of Al–Cu liquid alloys: measurement and thermodynamic description

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Abstract

In the present work a high temperature oscillating cup viscometer has been used to measure the viscosities of liquid binary Al–Cu alloys. The dependence of viscosity on temperature is well described by the Arrhenius law. For constant temperature, the viscosity as a function of copper concentration exhibits a maximum at a mole fraction x Cu = 0.7. This might be due to a pronounced chemical short range order in the liquid phase at this composition. As the comparison of existing phenomenological models describing viscosity as a function of composition to the experimental data is unsatisfactory, a new model for the viscosity has been developed within this work based only on a few assumptions and using the enthalpy of mixing as input parameter which is easily accessible. The agreement between model calculation and experimental data is excellent.

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Acknowledgements

The support of this work by Deutsche Forschungsgemeinschaft (DFG) under Contract No. EG 93/8-1 is gratefully acknowledged.

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Authors and Affiliations

  1. Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Materialphysik im Weltraum, 51170, Köln, Germany

    Michael Schick, Jürgen Brillo & Ivan Egry

  2. Materials Chemistry, RWTH Aachen University, 52074, Aachen, Germany

    Michael Schick & Bengt Hallstedt

Authors
  1. Michael Schick
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  2. Jürgen Brillo
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  3. Ivan Egry
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  4. Bengt Hallstedt
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Correspondence to Jürgen Brillo.

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Schick, M., Brillo, J., Egry, I. et al. Viscosity of Al–Cu liquid alloys: measurement and thermodynamic description. J Mater Sci 47, 8145–8152 (2012). https://doi.org/10.1007/s10853-012-6710-x

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