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Effect of the Strain and Strain Rate on Microstructure Evolution and Superplastic Deformation Mechanisms

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Abstract

Parameters of superplasticity of the Al–7.6% Mg–0.6% Mn–0.25% Cr alloy have been studied in the range of 490–520°C, and the optimum temperature of deformation has been determined. The evolution of the grain structure in the bulk and on the surface of samples during the superplastic deformation at a temperature of 510°C has been analyzed. The contribution of grain-boundary sliding has been estimated in the strain-rate regime of superplastic deformation according to the results of the analysis of changes in the structure of the surface with preliminarily applied marker scratches. The contribution of grain-boundary sliding to the total deformation is 20–30%; the contribution of diffusion creep decreases from 40 to 20% with an increase in the deformation rate by an order of magnitude, from 1 × 10–3 to 1 × 10–2 s–1. The intragranular deformation is localized in the peripheral regions of grains and in the region of striated zones.

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ACKNOWLEDGMENTS

The work was supported by the Ministry of Education and Science of the Russia Federation in the framework of the Federal task no. 11.7172.2017/8.9 for 2017–2020.

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Authors and Affiliations

  1. Department of the Metallurgical Science of Nonferrous Metals, National University of Science and Technology MISiS, 119049, Moscow, Russia

    O. A. Yakovtseva, A. V. Mikhaylovskaya, A. D. Kotov, O. I. Mamzurina & V. K. Portnoy

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  1. O. A. Yakovtseva
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  2. A. V. Mikhaylovskaya
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  3. A. D. Kotov
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  4. O. I. Mamzurina
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  5. V. K. Portnoy
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Correspondence to O. A. Yakovtseva.

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Translated by S. Gorin

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Yakovtseva, O.A., Mikhaylovskaya, A.V., Kotov, A.D. et al. Effect of the Strain and Strain Rate on Microstructure Evolution and Superplastic Deformation Mechanisms. Phys. Metals Metallogr. 120, 87–94 (2019). https://doi.org/10.1134/S0031918X18110224

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  • DOI: https://doi.org/10.1134/S0031918X18110224

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