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Changes in the diffusion properties of nonequilibrium grain boundaries upon recrystallization and superplastic deformation of submicrocrystalline metals and alloys

  • Mechanical Properties, Physics of Strength, and Plasticity
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Abstract

The effect of an increase in the coefficient of the grain-boundary diffusion upon recrystallization and superplastic deformation of submicrocrystalline (SMC) materials prepared by severe plastic deformation has been studied. It is shown that the coefficient of the grain-boundary diffusion of the SMC materials is dependent on the intensity of the lattice dislocation flow whose value is proportional to the rate of the grain boundary migration upon annealing of SMC metals or the rate of the intragrain deformation under conditions of superplastic deformation of SMC alloys. It is found that, at a high rate of grain boundary migrations and high rates of superplastic deformation, the intensity of the lattice dislocation flow bombarding grain boundaries of SMC materials is higher than the intensity of their diffusion accommodation, which leads to an increase in the coefficient of the grain-boundary diffusion and a decrease in the activation energy. The results of the numerical calculations agree well with the experimental data.

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Authors and Affiliations

  1. Research Physicotechnial Institute (NIFTI), Lobachevskii Nizhny Novgorod State University, pr. Gagarina 23, korp. 3, Nizhny Novgorod, 603600, Russia

    V. N. Chuvil’deev, A. V. Nokhrin, O. E. Pirozhnikova, M. Yu. Gryaznov, Yu. G. Lopatin & V. I. Kopylov

  2. Institute of Solid State Physics, Russian Academy of Sciences, ul. Akademika Ossipyana 2, Chernogolovka, Moscow oblast, 142432, Russia

    M. M. Myshlyaev

  3. Baikov Institute of Metallurgy and Materials Sciences, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    M. M. Myshlyaev

  4. Physical–Technical Institute of the National Academy of Sciences of Belarus, ul. Kuprevicha 10, Minsk, 2200141, Belarus

    V. I. Kopylov

Authors
  1. V. N. Chuvil’deev
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  2. A. V. Nokhrin
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  3. O. E. Pirozhnikova
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  4. M. Yu. Gryaznov
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  5. Yu. G. Lopatin
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  6. M. M. Myshlyaev
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  7. V. I. Kopylov
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Corresponding author

Correspondence to A. V. Nokhrin.

Additional information

Original Russian Text © V.N. Chuvil’deev, A.V. Nokhrin, O.E. Pirozhnikova, M.Yu. Gryaznov, Yu.G. Lopatin, M.M. Myshlyaev, V.I. Kopylov, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 8, pp. 1561–1569.

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Chuvil’deev, V.N., Nokhrin, A.V., Pirozhnikova, O.E. et al. Changes in the diffusion properties of nonequilibrium grain boundaries upon recrystallization and superplastic deformation of submicrocrystalline metals and alloys. Phys. Solid State 59, 1584–1593 (2017). https://doi.org/10.1134/S1063783417080066

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  • DOI: https://doi.org/10.1134/S1063783417080066

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