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Thermal stability of nickel structure obtained by high-pressure torsion in liquid nitrogen

  • Structure, Phase Transformations, and Diffusion
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Abstract

Using transmission electron microscopy and durometry, the structural evolution of commercially pure nickel (99.6%) under high-pressure torsion (HPT) in liquid nitrogen and subsequent annealings in the temperature range 100–400°C has been investigated. In this nickel, at cryogenic temperature, HPT gives rise to a nanocrystalline structure with the record high microhardness (6200 MPa) and average crystallite size ∼80 nm. The obtained structure is stable at room temperature and possesses a relatively low thermal stability, since recrystallization occurs at lower temperatures than after conventional deformation or HPT at room temperature.

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Authors and Affiliations

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

    V. V. Popov, E. N. Popova, D. D. Kuznetsov, A. V. Stolbovskii & V. P. Pilyugin

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  1. V. V. Popov
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  2. E. N. Popova
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  3. D. D. Kuznetsov
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  4. A. V. Stolbovskii
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  5. V. P. Pilyugin
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Correspondence to V. V. Popov.

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Original Russian Text © V.V. Popov, E.N. Popova, D.D. Kuznetsov, A.V. Stolbovskii, V.P. Pilyugin, 2014, published in Fizika Metallov i Metallovedenie, 2014, Vol. 115, No. 7, pp. 727–736.

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Popov, V.V., Popova, E.N., Kuznetsov, D.D. et al. Thermal stability of nickel structure obtained by high-pressure torsion in liquid nitrogen. Phys. Metals Metallogr. 115, 682–691 (2014). https://doi.org/10.1134/S0031918X14070060

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  • DOI: https://doi.org/10.1134/S0031918X14070060

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