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Formation of a Gradient Structure in a Material by Twist Extrusion

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Russian Metallurgy (Metally) Aims and scope

Abstract

Hexagonal samples with an initial coarse-grained structure (CG) in the near-axis zone and a gradient ultrafine-grained (UFG) structure at the periphery are formed by twist extrusion (TE) of commercial-purity copper through a hexagonal twist die with a small twist-line slope. This hybrid structure of the samples provides conditions for a large uniform deformation before necking (due to the CG core) and a high yield strength (due to the gradient UFG periphery). The hybrid CG–UFG structure can be formed due to the threshold nature of metal grain refinement during cyclic deformation. A simple relation is derived for estimating the CG core diameter of the sample. The structure and the texture of the samples are investigated by X‑ray diffraction and optical microscopy.

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Authors and Affiliations

  1. Donetsk Institute for Physics and Engineering named after A.A. Galkin, Donetsk, Ukraine

    O. V. Prokof’eva, A. N. Sapronov, D. V. Prilepo & V. N. Varyukhin

  2. Donetsk Institute for Physics and Engineering named after A.A. Galkin, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    Y. Y. Beygelzimer

  3. Ushinskii South-Ukrainian National Pedagogical University, Odessa, Ukraine

    V. V. Usov, N. M. Shkatulyak & T. S. Sovkova

Authors
  1. O. V. Prokof’eva
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  2. Y. Y. Beygelzimer
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  3. V. V. Usov
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  4. N. M. Shkatulyak
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  5. T. S. Sovkova
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  6. A. N. Sapronov
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  7. D. V. Prilepo
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  8. V. N. Varyukhin
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Corresponding authors

Correspondence to O. V. Prokof’eva, Y. Y. Beygelzimer or V. V. Usov.

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Translated by T. Gapontseva

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Prokof’eva, O.V., Beygelzimer, Y.Y., Usov, V.V. et al. Formation of a Gradient Structure in a Material by Twist Extrusion. Russ. Metall. 2020, 573–578 (2020). https://doi.org/10.1134/S0036029520050110

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  • DOI: https://doi.org/10.1134/S0036029520050110

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