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Influence of Equal-Channel Angular Pressing on Grain Structure and Internal Stresses of Technically Pure Nickel

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Using transmission electron microscopy, the structure, phase composition, defects, amplitude of internal stresses and their sources are studied in the ultrafine-grained technically pure nickel produced by the method of equal-channel angular pressing (ECAP). During ECAP, the samples are subjected to shear deformation by compression along two intersecting channels of equal diameters at an angle of 120° and a temperature of T = 400°C without intermediate annealing within four passes, n = 4. An examination of the grain structure demonstrates that all grains are anisotropic. According to the dislocation structure, the grains are classified into three types: 1) the smallest grains with no substructure (practically no dislocations) – dislocation-free grains, 2) larger grains containing chaotically distributed dislocations or a net substructure, and 3) the largest grains with a cellular or fragmented substructure. The average value of the scalar dislocation density in the grains of each type is calculated. It is found out that equal-channel angular pressing results in the formation of nanosized particles of secondary phases localized inside the grains, at grain boundaries and at grain junctions of ultrafine-grained nickel. The sources of internal stresses are revealed and their amplitude is determined. The amplitude of the internal stresses is calculated using the amplitude of the crystal lattice curvature-torsion from the bending extinction contours

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Authors and Affiliations

  1. Tomsk State University of Architecture and Building, Tomsk, Russia

    N. A. Popova, E. L. Nikonenko, Yu. V. Solov’eva & V. A. Starenchenko

  2. National Research Tomsk Polytechnic University, Tomsk, Russia

    E. L. Nikonenko

Authors
  1. N. A. Popova
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  2. E. L. Nikonenko
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  3. Yu. V. Solov’eva
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  4. V. A. Starenchenko
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Correspondence to N. A. Popova.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 20–26, September, 2022.

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Popova, N.A., Nikonenko, E.L., Solov’eva, Y.V. et al. Influence of Equal-Channel Angular Pressing on Grain Structure and Internal Stresses of Technically Pure Nickel. Russ Phys J 65, 1436–1442 (2023). https://doi.org/10.1007/s11182-023-02788-5

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  • DOI: https://doi.org/10.1007/s11182-023-02788-5

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