Formation and evolution of the microstructure of materials under the influence of intensive low-energy ion beams
Project 01-02-97039 jointly funded by
Russian Foundation for Basic Research
and the Governement of the Moscow Region









Head of the project
D. Sc. B. B. Straumal - leading research scientist

Participants

  • Dr. V. G. Sursaeva - senior research scientist
  • Dr. A. N. Aleshin - senior research scientist
  • Dr. N.F. Vershinin- senior research scientist
  • Ing. S. G. Protasova - research scientist
  • Ing. S. A. Polyakov- junior research scientist
  • M. B. Juskov - technician

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    The technology of ionic implantation appeared in 60-s and was extencively applied in microelectronics and semiconductor technologies mainly for the creation of doped surface layers with definite conductivity. In these methods of ionic implantation the high energies of ion and low ionic fluxes are emplyed. Later the technologies were developed combining the thermal treatment of a material with ionic impantation from glue discharge. This method allows one to produce the surface layers with a high concentration of alloyng element (like nitrogen) with a thickness up to several tens of microns. These materials with alloyed layers can be used in machinery, car and aviation industry. Recently, we developed a novel Hall current accelerator which can be used for the low-voltage ionic implantation. This accelerator combines the relative low ionic energies (0.1. to 10 keV) with high dencities of ionic flux (up to 13 mA/cm2). Large aperture (up to 1400 mm) allows one the treatment of the large-area substrates. The ionic nitriding of austenitic stainless steel and ferritic low-carbon steel has been studied. The influence of ionic current, energy of ions and implantation time are determined. The depth profiles measured with the aid of secondary-ion mass spectroscopy are presented. The hardness after ionic nitriding is characterized. The anomally quick penetration of nitrogen penetration in the austenitic stainless steel having the dencely packed face centered cubic (fcc) latice is observed. The ideas about subplantion of ions and radiation-enhanced diffusion of nitrogen atoms into the substrate are used for the explanation of this effect. The possible influence of the grain boundary phase transitions leading the the formation of the metasable base centered cubic phase with high duffusion permeabilty at the grain boundaries in the fcc-iron is also discussed.

    List of publications

    1. B. B. Straumal, N.F. Vershinin, S. A. Polyakov, A. Cantarero, M. Friesel
    Formation and evolution of microstructure of materials under the influence of
    the low energy high density flux of nitrogen ions (in Russian)
    "Advanced materials and technologies. Innovations of XXI century"
    (Eds. Yu.A. Ossipjan et al.), Chernogolovka, Russia (2001) p. 48. ISBN 5-901674-02-09
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    2. B. B. Straumal, N. F. Vershinin, S. A. Polyakov, M. Friesel, P. Fogarassy
    Preparation of large area substrates using high aperture Hall current accelerator
    In: Pulverizarea termica, D. Böhme et al. (eds.)
    ISIM, Timisoara, Romania (2000) 193199
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    3. B. B. Straumal, N. F. Vershinin, S. A. Polyakov, P. V. Orlova, M. Friesel, W. Gust
    Ion cleaning and nitriding using a high aperture Hall current accelerator
    In: Progress in plasma processing of materials 2001, ed. P. Fauchais,
    Begell House, New York (2001) pp. 573578.
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    4. B. Straumal, N. F. Vershinin, M. Friesel, T. V. Ischenko, S. A. Polyakov, W. Gust
    Ionic nitriding of austenitic and ferritic steel with the aid of a
    high aperture Hall current accelerator
    Def. Diff. Forum 194-199 (2001) 14571462
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    Presentations at scientific conferences

    1. B. B. Straumal, N.F. Vershinin, S. A. Polyakov, A. Cantarero, M. Friesel
    Formation and evolution of microstructure of materials under the influence
    of the low energy high density flux of nitrogen ions (in Russian)
    Regional conference "Investigations and developments in the scientific towns of Moscow Region.
    Advanced materials and technologies. Innovations of XXI century" (poster)
    October 0105, 2001, Chernogolovka, Russia