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Superplasticity of High-Strength Submicrocrystalline Al–0.5Mg–Sc Aluminum Alloys

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Abstract

The effect of scandium on the superplasticity characteristics of Al–0.5Mg–Sc conductor aluminum alloys with a submicrocrystalline (SMC) structure is investigated. Large elongation to failure (~1060%) is achieved in the SMC alloys with 0.4 and 0.5% Sc at a deformation temperature of 500°C and a strain rate of 1 × 10–1 s–1. Intense pore formation is shown to occur during the superplasticity of the Al–0.5Mg–Sc SMC alloys. The kinetics of deformation-stimulated grain growth in the Al–0.5Mg–Sc SMC alloys is found to be determined by the mobility of junction disclinations and orientation-misfit dislocations.

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Notes

  1. From here on, the element contents are given in wt %.

  2. The microstructure of the as-cast and SMC Al–0.5% Mg–Sc alloys was described in detail in [10].

  3. The fact that HV0.5 does not depend on the annealing temperature and the grain size for the Al–0.5% Mg SMC alloy is mainly caused by the small indentation size, which is comparable with the grain size during intense grain growth.

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ACKNOWLEDGMENTS

We thank V.V. Zakharov (AO All-Russia Institute of Light Alloys) for his recommendations on the choice of aluminum alloy casting conditions.

Funding

This work was supported by the Russian Science Foundation, project no. 18-13-00306.

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Authors and Affiliations

  1. Lobachevskii National Research State University of Nizhny Novgorod, Nizhny Novgorod, Russia

    V. N. Chuvil’deev, M. Yu. Gryaznov, S. V. Shotin, A. V. Nokhrin, V. I. Kopylov, K. V. Likhnitskii, M. K. Chegurov, A. A. Bobrov & O. E. Pirozhnikova

  2. Physicotechnical Institute, Belarussian Academy of Sciences, Minsk, Belarus

    V. I. Kopylov

  3. Prokhorov General Physics Institute of the Russian Academy of Science, Moscow, Russia

    N. Yu. Tabachkova

  4. National Research University of Science and Technology MISiS, Moscow, Russia

    N. Yu. Tabachkova

Authors
  1. V. N. Chuvil’deev
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  2. M. Yu. Gryaznov
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  3. S. V. Shotin
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  4. A. V. Nokhrin
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  5. V. I. Kopylov
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  6. K. V. Likhnitskii
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  7. M. K. Chegurov
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  8. N. Yu. Tabachkova
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  9. A. A. Bobrov
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  10. O. E. Pirozhnikova
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Correspondence to V. N. Chuvil’deev.

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Translated by K. Shakhlevich

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Chuvil’deev, V.N., Gryaznov, M.Y., Shotin, S.V. et al. Superplasticity of High-Strength Submicrocrystalline Al–0.5Mg–Sc Aluminum Alloys. Russ. Metall. 2021, 1102–1115 (2021). https://doi.org/10.1134/S0036029521090068

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  • DOI: https://doi.org/10.1134/S0036029521090068

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