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Evolution of the structure upon heating of submicrocrystalline and nanocrystalline copper produced by high-rate deformation

  • Structure, Phase Transformations, and Diffusion
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Abstract

Methods of electron microscopy, dilatometry, and microhardness and resistivity measurements have been used to study the effect of annealing on the process of recrystallization of a mixed submicrocrys-talline+nanocrystalline (SMC+NC) structure of 99.8% copper produced by high-rate (∼105 s−1) deformation using dynamic channel angular pressing (DCAP). It has been shown that the SMC+NC structure of copper is thermally stable upon heating to a temperature of 150°C. It has been found that the ρ/ρ0 ratio of copper with an SMC+NC structure at a temperature of 4.2 K is considerably (by 5 times) higher than ρ/ρ0 of copper in the annealed coarse-grained state. This effect is due to a high concentration of defects and a high degree of dispersity of the copper structure after DCAP. Changes in the microhardness and in the resistivity (at a temperature of 4.2 K) of the SMC+NC copper after annealing characterize the level of relaxation processes.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    I. V. Khomskaya, V. I. Zel’dovich, A. E. Kheifets, N. Yu. Frolova, V. P. Dyakina & V. A. Kazantsev

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  1. I. V. Khomskaya
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  2. V. I. Zel’dovich
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  3. A. E. Kheifets
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  4. N. Yu. Frolova
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  5. V. P. Dyakina
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  6. V. A. Kazantsev
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Original Russian Text © I.V. Khomskaya, V.I. Zel’dovich, A.E. Kheifets, N.Yu. Frolova, V.P. Dyakina, V.A. Kazantsev, 2011, published in Fizika Metallov i Metallovedenie, 2011, Vol. 111, No. 4, pp. 383–390.

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Khomskaya, I.V., Zel’dovich, V.I., Kheifets, A.E. et al. Evolution of the structure upon heating of submicrocrystalline and nanocrystalline copper produced by high-rate deformation. Phys. Metals Metallogr. 111, 367–374 (2011). https://doi.org/10.1134/S0031918X11030070

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  • DOI: https://doi.org/10.1134/S0031918X11030070

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