Study of supersaturated solid solution decomposition during quenching of sheets from Al-Mg-Si aluminum alloy

I. Benarieb; Бенариеб И.; Yu. A. Puchkov; Пучков Ю. А.; S. V. Sbitneva; Сбитнева С. В.; D. V. Zaytsev; Зайцев Д. В.

doi:10.31857/S0015323023600843

Study of supersaturated solid solution decomposition during quenching of sheets from Al-Mg-Si aluminum alloy

Authors: Benarieb I.¹, Puchkov Y.A.², Sbitneva S.V.¹, Zaytsev D.V.¹
Affiliations:
1. National Research Center “Kurchatov Institute”
2. Bauman Moscow State Technical University
Issue: Vol 124, No 9 (2023)
Pages: 838-845
Section: СТРУКТУРА, ФАЗОВЫЕ ПРЕВРАЩЕНИЯ И ДИФФУЗИЯ
URL: https://journal-vniispk.ru/0015-3230/article/view/139488
DOI: https://doi.org/10.31857/S0015323023600843
EDN: https://elibrary.ru/YYQCFR
ID: 139488

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Abstract

This paper presents the results of a study of the stability of a supersaturated solid solution (SSS) of sheets made of thermally hardened aluminum alloy of the Al-Mg-Si system with a small addition of copper (Al-0.6Mg-1.0Si-0.2Cu) under various quenching modes. The samples were subjected to isothermal or continuous quenching with different quenching cooling rates, after which artificial aging was carried out at a temperature of 170°C. From the results of thermodynamic modeling of the equilibrium phase composition of the alloy, it was found that for the temperature range from 300 to 530°C, the presence of the β-phase (Mg2Si) is most likely. With the use of transmission electron microscopy and X-ray spectral microanalysis, it was found that during quenching, the decomposition of SSS leads to the precipitation of undesirable large particles of metastable β-type phases or equilibrium β-phase. The nucleation of the secretions is realized in the form of rod-shaped particles by a heterogeneous mechanism mainly on the surface of the α-phase dispersoids (Al15(Mn,Fe)3Si2), which thus significantly increase the quenching sensitivity of the alloy. The formation of these secretions at a low quenching rate causes, during subsequent aging, a decrease in the proportion and density of formation of strengthening particles of the β" phase, and also leads to an increase in their size and heterogeneity of distribution in the aluminum matrix, which reduces the potential of dispersion hardening during aging and corrosion resistance of the material.

Keywords

alloys of the Al-Mg-Si system, hardening, aging, hardening rate, solid solution stability, phase composition, dispersoid, phase transformation, translucent

References

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