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Grain Size Effects on Static and Dynamic Strength of Ultrafine-Grained Al-Mg-Mn Alloy Produced by High-Pressure Torsion

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Abstract

In the paper, the structure and static and dynamic mechanical properties of ultrafine-grained A5083 alloy (Al-Mg-Mn) produced by high-pressure torsion (HPT) are reported. The static yield stress and tensile strength were determined in tensile tests at a strain rate of ~ 10−3 s−1, and the dynamic yield stress and spall strength were calculated from free-surface velocity histories obtained during shock-wave loading at a strain rate of 105 s−1. The HPT technique provides strong grain refinement. The average grain size of the alloy after HPT is 100-180 nm and depends on the accumulated true strain. HPT significantly improves the static strength properties of the alloy. The static yield stress is increased by 360-390% and the static ultimate tensile strength by 166-182%. It is shown that the dynamic yield stress improved by 168-181%, while the dynamic spall strength was not improved by HPT. Moreover, the nanostructured alloy with a grain size of ~ 100 nm demonstrates the lowest spall strength.

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Acknowledgments

Structural investigation and static tensile tests were carried out within the state assignment of Minobrnauki of Russia (theme “Struktura”, No. AAAA-A18-118020190116-6), supported in part by RFBR (Project 18-03-00102). The transmission electron microscopy investigations were carried out at the Center of Collaborative Access “Testing Center of Nanotechnologies and Advanced Materials” of the M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences. The dynamic experiments were performed using equipment of the Moscow Regional Explosion Research Center of Collective Use of the Russian Academy of Sciences under financial support of the Program of Basic Researches of Presidium of Russian Academy of Sciences (No. 13P) “Condensed matter and plasma under high energy density”.

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Authors and Affiliations

  1. M.N. Miheev Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskoi Str., Ekaterinburg, Russia, 620990

    A. N. Petrova & I. G. Brodova

  2. Ural Federal University Named After the First President of Russia B. N. Yeltsin, 19 Mira Str., Ekaterinburg, Russia, 620002

    A. N. Petrova & I. G. Brodova

  3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 Semenova pr., Chernogolovka, Moscow Region, Russia, 142432

    S. V. Razorenov

  4. National Research Tomsk State University, 36 Lenina pr., Tomsk, Russia, 634050

    S. V. Razorenov

  5. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx Str., Ufa, Russia, 450008

    E. V. Bobruk

  6. Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, 28 Universitetsky pr., Peterhof, Saint Petersburg, Russia, 198504

    E. V. Bobruk

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  1. A. N. Petrova
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  2. I. G. Brodova
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  3. S. V. Razorenov
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  4. E. V. Bobruk
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Correspondence to E. V. Bobruk.

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Petrova, A.N., Brodova, I.G., Razorenov, S.V. et al. Grain Size Effects on Static and Dynamic Strength of Ultrafine-Grained Al-Mg-Mn Alloy Produced by High-Pressure Torsion. J. of Materi Eng and Perform 29, 464–469 (2020). https://doi.org/10.1007/s11665-019-04511-3

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  • DOI: https://doi.org/10.1007/s11665-019-04511-3

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