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The Microstructure and Mechanical Properties of Al–Mg–Fe–Ni–Zr–Sc Alloy after Isothermal Multidirectional Forging

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Abstract

The effects of isothermal multidirectional forging (IMF) on the grain structure, second-phase particles of solidification origin, and dispersoids in the Al–4.9Mg–0.9Ni–0.9Fe–0.2Zr–0.1Sc alloy have been investigated. The strain distribution over the sample volume during forging in a closed die has been analyzed using a finite-element simulation. A method of considering the friction effect and changes in strain rate when constructing stress–strain curves based on the IMF results has been proposed. Increasing the number of phase cycles at 350°C has resulted in a two-fold decrease in the average phase particle size of solidification origin and the formation of a structure with an average grain size of 1.3 ± 0.2 μm, but did not change the parameters of dispersoids. IMF increased the yield strength of the alloy by 60% and the tensile strength by 20%.

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Funding

Deformation behavior and mechanical properties were analyzed within the grant NSh-1752.2022.4, microstructural and finite-element analyses were performed within the framework of Russian Science Foundation 17-79-20426. TEM studies were carried out at the MISIS Material Science and Metallurgy Center of Collective Use, equipped at the expense of a project of the Russian Federation State Task No. 075-15-2021-696 for the purchase of equipment.

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

    A. A. Kishchik, M. S. Kishchik, A. Yu. Churyumov & A. V. Mikhaylovskaya

  2. National Research University “Higher School of Economics”, MIEM (Moscow Institute of Electronics and Mathematics), 123458, Moscow, Russia

    S. A. Aksenov & D. O. Demin

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Kishchik, A.A., Aksenov, S.A., Kishchik, M.S. et al. The Microstructure and Mechanical Properties of Al–Mg–Fe–Ni–Zr–Sc Alloy after Isothermal Multidirectional Forging. Phys. Metals Metallogr. 124, 623–631 (2023). https://doi.org/10.1134/S0031918X23600665

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