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Theoretical and Experimental Investigations of the Process of Vibration Treatment of Liquid Metals Containing Nanoparticles

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Abstract

It is known that the use of external effects, such as acoustic fields (from ultrasonic to low-frequency range), help in breaking down agglomerates, improving particle wettability, providing uniform particle distribution in the melt volume, and reducing the grain size. The fragmentation of growing crystals, de-agglomeration of particles and their mixing in liquid metal under the influence of vibration (with frequencies of 10–100 Hz) are considered in this paper. The major advantage of such a technique in comparison with high-frequency methods (sonic, ultrasonic) is the capability of processing large melt volumes proportional to the wavelength. The mechanisms of the breaking down of particle agglomerates and the mixing of particles under conditions of cavitation and turbulence during the vibration treatment of the melt are considered. Expressions linking the threshold intensity and frequency with the amplitude necessary to activate mechanisms of turbulence and cavitation were obtained. The results of vibration treatment experiments for an aluminum alloy containing diamond nanoparticles are given. This treatment makes it possible to significantly reduce the grain size and to improve the casting homogeneity and thus improve the mechanical properties of the alloy.

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Acknowledgements

The work was financially supported by the Ministry of Education and Science of the Russian Federation within the framework of the Federal Target Program. Agreement No. 14.578.21.0098 (Unique identifier RFMEFI57814X0098).

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Authors and Affiliations

  1. National Research Tomsk State University, Tomsk, Russian Federation, 634050

    S. Vorozhtsov, O. Kudryashova, V. Promakhov, V. Dammer & A. Vorozhtsov

  2. Institute of Strength Physics and Materials Science SB RAS, Tomsk, Russian Federation, 634021

    S. Vorozhtsov

  3. Institute for Problems of Chemical & Energetic Technologies SB RAS, Biysk, Russian Federation, 659322

    O. Kudryashova & A. Vorozhtsov

Authors
  1. S. Vorozhtsov
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  2. O. Kudryashova
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  3. V. Promakhov
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  4. V. Dammer
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  5. A. Vorozhtsov
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Correspondence to S. Vorozhtsov.

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Vorozhtsov, S., Kudryashova, O., Promakhov, V. et al. Theoretical and Experimental Investigations of the Process of Vibration Treatment of Liquid Metals Containing Nanoparticles. JOM 68, 3094–3100 (2016). https://doi.org/10.1007/s11837-016-2147-z

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  • DOI: https://doi.org/10.1007/s11837-016-2147-z

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