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Structural Evolution in the Quenched Al–Zn–Mg–Fe–Ni Alloy during Severe Plastic Deformation and Annealing

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract—

The evolution of the structure and phase composition of the Al–Zn–Mg–Fe–Ni alloy (nikalin) during severe plastic deformation by high pressure torsion and annealing has been investigated using high-resolution TEM techniques. The deformation of the quenched alloy has been found to result in a submicron composite comprising an Al matrix and various fine aluminides. The severe structural refinement takes place along with phase transformations, which dissolve the metastable Al3Zr-phase particles and cause the nanosized strengthening phases Т (Al2Mg3Zn3) and η' (MgZn2) to precipitate from the Al solid solution which has been supersaturated in result of quenching and deformation. Nikalin has been determined to retain its submicrocrystalline state during low-temperature annealing (200°C, 4 h) due to the barrier effect of fine hardening phase particles, fixing grain boundaries. High-temperature heating to 400°C for four hours transfers nikalin to the overaged state, in which it is characterized to consist of a recrystallized matrix with grains 2–3 µm in size, eutectic micron-sized aluminides, and stable Al2Mg3Zn3 and MgZn2-phase particles with sizes of no more or equal to 500 nm.

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Funding

This work was performed within the scope of a State Task of the Ministry of Education and Science of the Russian Federation (theme “Struktura,” no. АААА-А18-118020190116-6) and supported in part by the Russian Foundation for Basic Research (project no. 18-03-00102). The electron microscopic studies were performed at the Center of the Collaborative Access “Test Center of Nanotechnologies and Advanced Materials,” Institute of Metal Physics, Ural Branch, Russian Academy of Sciences.

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    I. G. Brodova, I. G. Shirinkina & D. Yu. Rasposienko

  2. Ural Federal University Named after the First President of Russia B.N. Yeltsin, 620002, Ekaterinburg, Russia

    I. G. Brodova

  3. National University of Science and Technology MISiS, 119991, Moscow, Russia

    T. K. Akopyan

Authors
  1. I. G. Brodova
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  2. I. G. Shirinkina
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  3. D. Yu. Rasposienko
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  4. T. K. Akopyan
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Corresponding author

Correspondence to I. G. Brodova.

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Translated by T. Gapontseva

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Brodova, I.G., Shirinkina, I.G., Rasposienko, D.Y. et al. Structural Evolution in the Quenched Al–Zn–Mg–Fe–Ni Alloy during Severe Plastic Deformation and Annealing. Phys. Metals Metallogr. 121, 899–905 (2020). https://doi.org/10.1134/S0031918X20090033

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  • DOI: https://doi.org/10.1134/S0031918X20090033

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