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Influence of manganese on the phase composition and mechanical properties of Al-Zn-Mg-Cu-Zr-Y(Er) alloys

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Abstract

The effect of alloying with manganese and titanium on phase composition and mechanical properties of new Al-Zn-Mg-Cu-Zr-Y(Er) alloys is studied using thermodynamic calculations, scanning electron microscopy, and X-ray phase analysis. Introduction of manganese into AlZnMgCuZrY and AlZnMgCuZrEr alloys leads to formation of (Al,Cu)11Y3, Al25Cu4Mn2Y, and Al25Cu4Mn2Er phases respectively, in which up to 12 wt.% Zn is dissolved, which replaces aluminum atoms within the phase lattice. In the process of homogenization for phases enriched in yttrium or erbium hardly change their morphology, while T(Al,Zn,Mg,Cu) phase dissolves and transforms into the S(Al2CuMg) phase. In this case, according to calculations, Al6Mn, Al3Zr, and Al3Ti phases are present in equilibrium with (Al). Microstructural studies confirm presence of particles within aluminum solid solution (Al), i.e. heterogenization proceeds in parallel with homogenization. The course of heterogenization provides 7–15 HV greater hardness for alloys with manganese in a quenched condition, but they have a less alloyed solid solution in terms of Zn, Mg, and Cu, which reduces hardening during aging. Alloys doped with manganese and titanium are hardly inferior in terms of yield strength, and when temperature rises to 300–350 °C, they slightly surpass alloys without them. Modification with titanium leads to grain refinement, which contributes to yield strength, partly compensating for the lower alloying (Al).

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Funding

This study was supported by the Russian Science Foundation grant No. 22–79–10142, https://rscf.ru/project/22-79-10142/.

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  1. National University of Science and Technology MISIS, Moscow, Russian Federation

    M. V. Glavatskikh, R. Yu. Barkov, M. G. Khomutov & A. V. Pozdniakov

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  1. M. V. Glavatskikh
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  2. R. Yu. Barkov
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  3. M. G. Khomutov
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  4. A. V. Pozdniakov
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Correspondence to M. V. Glavatskikh.

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Translated from Metallurg, No. 12, pp. 47–53, December, 2023.

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Glavatskikh, M.V., Barkov, R.Y., Khomutov, M.G. et al. Influence of manganese on the phase composition and mechanical properties of Al-Zn-Mg-Cu-Zr-Y(Er) alloys. Metallurgist (2024). https://doi.org/10.1007/s11015-024-01683-9

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  • DOI: https://doi.org/10.1007/s11015-024-01683-9

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