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Microstructure, Mechanical, and Corrosion Properties of Cast Heat-Resistant Al–4Zn–4Mg–4Cu–Zr–Y(Er) Alloy

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Metallurgist Aims and scope

In this study, we analyze the microstructure, phase composition, aging process, and a set of characteristics of the performance properties of new casting Al–4Zn–4Mg–4Cu–0.2Zr alloys doped with yttrium (Y) or erbium (Er). Doping with Y or Er has been shown to decrease hot brittleness, enhance corrosion resistance, and slightly decrease strength characteristics at up to 200° C. When alloyed with Y or Er, enhanced casting properties are ensured through an increase in the proportion of eutectics and modification of the grain structure. The Al8Cu4Y, (Al, Cu)11Y3, Al8Cu4Er, and Al3Er phases containing Y and Er after homogenization at 465° C retain the shape of branched crystals, resulting in alloys with low ductility at up to 200° C. In all the alloys, after stretching at 250°C, the elongation considerably increases, and the yield strength is approximately the same and lies in the range of 217–222 MPa. Alloying with Y or Er results in less softening with increasing test temperature and considerably higher corrosion resistance under electrochemical corrosion conditions.

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Authors and Affiliations

  1. National University of Science and Technology “MISIS”, Moscow, Russia

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

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

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Translated from Metallurg, Vol. 67, No. 9, pp. 33–41, September, 2023, Russian DOI:https://doi.org/10.52351/00260827_2023_09_33.

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Glavatskikh, M.V., Gorlov, L.E., Barkov, R.Y. et al. Microstructure, Mechanical, and Corrosion Properties of Cast Heat-Resistant Al–4Zn–4Mg–4Cu–Zr–Y(Er) Alloy. Metallurgist 67, 1279–1292 (2024). https://doi.org/10.1007/s11015-024-01620-w

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