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Mechanisms of Superplastic High-Rate Deformation in the Al–Mg–Zn–Fe–Ni–Zr–Sc Alloy

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Abstract

The microstructure and acting superplastic deformation mechanisms in the high-strength Al–7.0% Zn–2.7% Mg–1.0% Ni–0.9% Fe alloy low-doped with Sc and Zr upon deformation at a temperature of 480°С and a strain rate of 1 × 10–2 s–1 at a stable flow stage in a true strain range of 1.1 to 1.6 have been investigated. To evaluate the contributions of superplastic deformation mechanisms to the total elongation, marker grids have been applied on the surface by ion etching, and microstructural changes of the surface have been analyzed. Grain boundary sliding and intragranular deformation play dominant roles. The contribution of each mechanism is 35–40%. The remaining 25% belongs to the diffusional creep mechanism, which is determined from the size of striated zones formed at the transverse grain boundaries on the surface of a deformed sample.

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Funding

This work was supported by the Russian Scientific Foundation (project no. 17-79-20426).

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Authors and Affiliations

  1. National University of Science and Technology MISiS, 119049, Moscow, Russia

    O. A. Yakovtseva, A. D. Kotov, M. N. Sitkina & A. V. Mikhaylovskaya

  2. Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    A. V. Irzhak

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  1. O. A. Yakovtseva
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Correspondence to A. V. Mikhaylovskaya.

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Translated by T. Gapontseva

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Yakovtseva, O.A., Kotov, A.D., Sitkina, M.N. et al. Mechanisms of Superplastic High-Rate Deformation in the Al–Mg–Zn–Fe–Ni–Zr–Sc Alloy. Phys. Metals Metallogr. 120, 1014–1020 (2019). https://doi.org/10.1134/S0031918X19100156

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  • DOI: https://doi.org/10.1134/S0031918X19100156

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