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The Effects of Impurities on the Phase Composition and the Properties of the Al–Cu–Gd Alloy

Physics of Metals and Metallography volume 123, pages 604–608 (2022)Cite this article

Abstract

The effect of impurities on the phase composition and the properties of a new quasibinary Al–Cu–Gd alloy have been investigated. The microstructure in the cast alloy consists of an aluminum solid solution, a dispersed eutectic with the Al8Cu4Gd phase with approximately 1% iron impurity dissolved, and an (AlGdCuSi) phase with an approximate composition of Al80Gd5Cu8Si5. High-temperature homogenization at 600°С results in the fragmentation and spheroidization of the solidification-induced phases, including the silicon-containing phase. The annealing of cold-worked sheets at temperatures up to 250°C results in roughly the same softening associated with the recovery and polygonization processes in alloys with and without impurities. The structure is completely recrystallized after 1-hour annealing at 300°C and has an average grain size of 7.5 μm, which slightly increases to 11 μm after annealing at 550°C. The yield strength of the alloys rolled and annealed at 100–150°С is 227–276 MPa with elongation of 5%. Iron and silicon impurities have no negative effects on the microstructure and mechanical properties of this new alloy.

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ACKNOWLEDGMENTS

The authors thank the members of the scientific school NSh-1752.2022.4 for discussing the results.

Funding

This work was supported by the Russian Scientific Foundation (project no. 21-79-00193).

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Authors and Affiliations

  1. National University of Science and Technology MISiS, 119049, Moscow, Russia

    M. V. Barkov, O. I. Mamzurina, M. V. Glavatskikh, R. Yu. Barkov & A. V. Pozdniakov

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  1. M. V. Barkov
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  2. O. I. Mamzurina
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  3. M. V. Glavatskikh
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  4. R. Yu. Barkov
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  5. A. V. Pozdniakov
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Correspondence to R. Yu. Barkov.

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Translated by T. Gapontseva

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Barkov, M.V., Mamzurina, O.I., Glavatskikh, M.V. et al. The Effects of Impurities on the Phase Composition and the Properties of the Al–Cu–Gd Alloy. Phys. Metals Metallogr. 123, 604–608 (2022). https://doi.org/10.1134/S0031918X22060035

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  • DOI: https://doi.org/10.1134/S0031918X22060035

Keywords:

  • aluminum alloys
  • gadolinium
  • impurities
  • microstructure
  • phase composition
  • hardness