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Evolution of a Defect Structure during Creep Tests of Ultrafine-Grained Metals and Alloys Produced by Severe Plastic Deformation

  • MECHANICAL PROPERTIES, PHYSICS OF STRENGTH, AND PLASTICITY
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Abstract

The structural factors that lead to a decrease in the mechanostability of ultrafine-grained (UFG) metals and alloys during creep tests at increased temperatures have been revealed using small-angle X-ray scattering, electron microscopy, and the measurements of the density. An important factor is found to be nanopores that form during severe plastic deformation. The development of these nanopores in grain boundaries, which form during the creep, occurs by a diffusion mechanism and leads to the fracture. The role of disperse inclusions and high-angle grain boundaries in the strength of UFG metals and alloys during their “short-time” and long-term loadings is considered.

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ACKNOWLEDGMENTS

A number of structural studies and creep tests were carried out at the Institute of Metal Physics (Brno, Czech Republic). The authors are grateful to collaborators of this Institute V. Sklenicka, J. Dvorak, P. Kral, and M. Svoboda who took part in joint studies of the evolution of the defect structure during creep of coarse-grained and UFG metals [5, 7, 8, 11, 14, 17–20].

Funding

This work was supported by the Russian Scientific Foundation, project no. 19-12-00221.

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Authors and Affiliations

  1. Ioffe Institute, 194021, St. Petersburg, Russia

    V. I. Betekhtin, A. G. Kadomtsev & M. V. Narykova

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  1. V. I. Betekhtin
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  2. A. G. Kadomtsev
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  3. M. V. Narykova
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Corresponding author

Correspondence to M. V. Narykova.

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The authors declare that they have no conflicts of interest.

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Translated by Yu. Ryzhkov

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Betekhtin, V.I., Kadomtsev, A.G. & Narykova, M.V. Evolution of a Defect Structure during Creep Tests of Ultrafine-Grained Metals and Alloys Produced by Severe Plastic Deformation. Phys. Solid State 62, 318–324 (2020). https://doi.org/10.1134/S1063783420020067

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