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Viscous and acoustic properties of AlCu melts

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Abstract

The atomic dynamics of the binary Al100–x Cu x system is simulated at a temperature T = 973 K, a pressure p = 1.0 bar, and various copper concentrations x. These conditions (temperature, pressure) make it possible to cover the equilibrium liquid Al100–x Cu x phase at copper concentrations 0 ≤ x ≤ 40% and the supercooled melt in the concentration range 40% ≤ x ≤ 100%. The calculated spectral densities of the time correlation functions of the longitudinal \({\tilde C_L}\)(k, ω) and transverse \({\tilde C_T}\)(k, ω) currents in the Al100–x Cu x melt at a temperature T = 973 K reveal propagating collective excitations of longitudinal and transverse polarizations in a wide wavenumber range. It is shown that the maximum sound velocity in the v L (x) concentration dependence takes place for the equilibrium melt at an atomic copper concentration x = 10 ± 5%, whereas the supercooled Al100–x Cu x melt saturated with copper atoms (x ≥ 40%) is characterized by the minimum sound velocity. In the case of the supercooled melt, the concentration dependence of the kinematic viscosity ν(x) is found to be interpolated by a linear dependence, and a deviation from the linear dependence is observed in the case of equilibrium melt at x < 40%. An insignificant shoulder in the ν(x) dependence is observed at low copper concentrations (x < 20%), and it is supported by the experimental data. This shoulder is caused by the specific features in the concentration dependence of the density ρ(x).

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Authors and Affiliations

  1. Kazan Federal University, Kazan, 420008, Russia

    R. M. Khusnutdinoff & A. V. Mokshin

  2. Landau Institute of Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    R. M. Khusnutdinoff & A. V. Mokshin

  3. Physicotechnical Institute, Ural Branch, Russian Academy of Sciences, Izhevsk, 426000, Russia

    S. G. Menshikova, A. L. Beltyukov & V. I. Ladyanov

Authors
  1. R. M. Khusnutdinoff
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  2. A. V. Mokshin
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  3. S. G. Menshikova
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  4. A. L. Beltyukov
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  5. V. I. Ladyanov
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Correspondence to R. M. Khusnutdinoff.

Additional information

Original Russian Text © R.M. Khusnutdinoff, A.V. Mokshin, S.G. Menshikova, A.L. Beltyukov, V.I. Ladyanov, 2016, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 149, No. 5, pp. 994–1004.

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Khusnutdinoff, R.M., Mokshin, A.V., Menshikova, S.G. et al. Viscous and acoustic properties of AlCu melts. J. Exp. Theor. Phys. 122, 859–868 (2016). https://doi.org/10.1134/S1063776116040166

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  • DOI: https://doi.org/10.1134/S1063776116040166

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