Introduction of 0.3% Cr into Al–Cu–Er–Zr alloy leads to significant modification of the grain structure and almost complete elimination of a dendritic structure. The average grain size of 40 μm corresponds to the size of a dendritic cell. The good modifying capacity is explained by formation of intermetallic compounds of the phase first identified of approximate composition Al75–80Cu10–12Er3–4Cr7, which is a substrate for nucleation of primary aluminum. After quenching and aging, slight hardening in the alloy is achieved due to L12 –Al3(Zr,Er) dispersoids with an average diameter of 40 nm and q’(Al2Cu) precipitates with a diameter up to 100 nm and a thickness up to 5 nm. No particles containing chromium are found within the matrix. According to thermodynamic calculations, hot rolling of AlCuErZrCr alloy at a temperature of 440°C should proceed in the ((Al)+Al3Zr+Al7Cr) phase region. However, analysis of the fine structure in an annealed condition after rolling showed presence of only L12 –Al3(Zr,Er) dispersoids. Differences in alloy hardness on annealing up to 300°C may be explained either by the influence of dissolved chromium atoms or by formation of chromium-containing particle clusters, which could not be detected.
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Translated from Metallurg, Vol. 67, No. 10, pp. 28–33, October, 2023. Russian https://doi.org/10.52351/00260827_2023_10_28
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Amer, S.M., Glavatskikh, M.V., Barkov, R.Y. et al. Effect of Chromium on Microstructure and Mechanical Properties of Al–Cu–Er–Zr Alloy. Metallurgist 67, 1448–1456 (2024). https://doi.org/10.1007/s11015-024-01637-1
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DOI: https://doi.org/10.1007/s11015-024-01637-1