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Effect of annealing on the microstructure and mechanical properties of ultrafine-grained commercially pure Al

  • Mechanical Properties, Physics of Strength, and Plasticity
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Abstract

The influence of annealing on the microstructure and mechanical properties of ultrafine-grained (UFG) commercially pure aluminum preliminarily subjected to severe plastic deformation by high pressure torsion has been studied. It is found that annealing of the UFG samples in the temperature range 363–473 K for 1 h leads to increases in the conventional yield strength and ultimate tensile strength, which attained maximum values (50 and 30%, respectively) after annealing at 423 K. A key role of nonequilibrium high-angle grain boundaries in the strengthening effect of UFG-Al due to annealing is discussed. The increase in the strength of UFG-Al is accompanied by a significant decrease in its ductility. A new approach of increasing the ductility of UFG-Al with retaining a high strength is proposed. It is an introduction of additional dislocation density to a UFG structure relaxed by annealing.

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Authors and Affiliations

  1. St. Petersburg National Research University of Information Technologies, Mechanics, and Optics, Kronverkskii pr. 49, St. Petersburg, 197101, Russia

    A. M. Mavlyutov, T. A. Latynina & T. S. Orlova

  2. Ioffe Institute, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia

    T. A. Latynina & T. S. Orlova

  3. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia

    M. Yu. Murashkin & R. Z. Valiev

  4. Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, ul. K. Marksa 12, Ufa, 450000, Russia

    M. Yu. Murashkin & R. Z. Valiev

Authors
  1. A. M. Mavlyutov
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  2. T. A. Latynina
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  3. M. Yu. Murashkin
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  4. R. Z. Valiev
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  5. T. S. Orlova
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Corresponding author

Correspondence to T. S. Orlova.

Additional information

Original Russian Text © A.M. Mavlyutov, T.A. Latynina, M.Yu. Murashkin, R.Z. Valiev, T.S. Orlova, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 10, pp. 1949–1955.

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Mavlyutov, A.M., Latynina, T.A., Murashkin, M.Y. et al. Effect of annealing on the microstructure and mechanical properties of ultrafine-grained commercially pure Al. Phys. Solid State 59, 1970–1977 (2017). https://doi.org/10.1134/S1063783417100274

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  • DOI: https://doi.org/10.1134/S1063783417100274

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