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Vacuum hot pressing of metal powders under the action of ultrasonic vibrations

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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

  1. 1.

    Using the theory of volume viscous flow of porous material, an analysis was carried out of the powder densification process, as a result of which it was established that ultrasonic vibrations raise the effective pressure in hot compaction.

  2. 2.

    The application of ultrasonic vibrations during the steady-state stage of powder particle creep in hot pressing accelerates creep and temporarily disturbs steady-state flow.

  3. 3.

    In hot pressing, the creep rate of iron and nickel powder particles is proportional to the square of the stress; it is shown that creep under these conditions is controlled by the dislocation climb process.

  4. 4.

    It was established that the efficiency of ultrasonic vibrations decreases with rise in temperature.

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Literature cited

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  7. V. R. Pokryshev and V. I. Marchenko, Poroshkovaya Met., No. 3, 98 (1966).

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Authors and Affiliations

  1. Institute of Materials Science, Academy of Sciences of the Ukrainian SSR, Ukraine

    V. R. Pokryshev, M. S. Koval'chenko & V. I. Marchenko

Authors
  1. V. R. Pokryshev
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  2. M. S. Koval'chenko
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  3. V. I. Marchenko
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Additional information

Translated from Poroshkovaya Metallurgiya, No. 10 (106), pp. 32–37, October, 1971.

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Pokryshev, V.R., Koval'chenko, M.S. & Marchenko, V.I. Vacuum hot pressing of metal powders under the action of ultrasonic vibrations. Powder Metall Met Ceram 10, 790–794 (1971). https://doi.org/10.1007/BF00794169

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  • DOI: https://doi.org/10.1007/BF00794169

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