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Metallurgist

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20.08.2024

Effect of retrograssion and re-aging on microstructure and properties of Al–Zn–Mg–Cu–Zr–Er alloy

verfasst von: M. V. Glavatskikh, L. E. Gorlov, R. Yu. Barkov, A. V. Pozdniakov

Erschienen in: Metallurgist | Ausgabe 5/2024

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Abstract

The study investigated the effect of retrogression and re-aging (RRA) on the structure and properties of the new Al–3.5Zn–3.5Mg–3.5Cu–1.6Er–0.2Zr–0.2Cr alloy through the use of scanning electron microscopy, thermodynamic calculations, hardness tests, current density, and corrosion potential. During the crystallization process, chromium is distributed between primary intermetallic compounds with an approximate composition of (Al,Zn)_79.8Mg_4.7Cu₃Cr_5.5(Er,Ti)₇, with a size of approximately 10 μm and an aluminum solid solution. Following two-stage homogenization heat treatment, the Al₈Cu₄Er and Mg₂Si phases exhibit minimal morphological changes, with the θ‑phase (Al₂Cu) being completely dissolved and the T‑phase (Al,Zn,Mg,Cu) transformed into the S‑phase (Al₂CuMg). Thermodynamic calculations indicate that the alloy should also contain the Al₃Zr and Al₄₅Cr₇ phases, which precipitate from the supersaturated solid solution during homogenization. Age hardening in the temperature range of 150–210 °C occurs due to the release of metastable modifications of the T‑phase. The combination of hardness (140 HV) and corrosion resistance (minimum corrosion current density 1 μA/cm²) is optimized by retrogression and re-aging.

Vorheriger Artikel Laser welding of aluminum-calcium alloys based on ((Al) + Al4(Ca, La)) eutectic

Nächster Artikel Effect of calcium additive on the kinetics of oxidation of solid lead babbit B(PbSb15Sn10)

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Titel: Effect of retrograssion and re-aging on microstructure and properties of Al–Zn–Mg–Cu–Zr–Er alloy
verfasst von: M. V. Glavatskikh
L. E. Gorlov
R. Yu. Barkov
A. V. Pozdniakov
Publikationsdatum: 20.08.2024
Verlag: Springer US
Erschienen in: Metallurgist / Ausgabe 5/2024
Print ISSN: 0026-0894
Elektronische ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-024-01776-5

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