Effect of Homogenization on the Superplasticity and Microsuperplasticity of the Al-Zn-Mg-Cu Aluminum Alloy

Authors V.V. Bryukhovetsky1 , D.E. Myla1,2, V.P. Poyda2, A.V. Poyda1

1Institute of Electrophysics and Radiation Technologies NAS of Ukraine, PO box 8812, 28, Chernyshevskiy St., 61002 Kharkiv, Ukraine

2V.N. Karazin Kharkiv National University, 4, Svobody Sq., 61000 Kharkiv, Ukraine

Е-mail bvv260170@ukr.net
Issue Volume 12, Year 2020, Number 6
Dates Received 03 September 2020; revised manuscript received 18 December 2020; published online 25 December 2020
Citation V.V. Bryukhovetsky, D.E. Myla, V.P. Poyda, A.V. Poyda, J. Nano- Electron. Phys. 12 No 6, 06025 (2020)
DOI https://doi.org/10.21272/jnep.12(6).06025
PACS Number(s) 62.20.Fe, 62.20.Hg
Keywords Aluminum alloy, Homogenization, Mechanisms of the formation of fibrous structures, Microsuperplasticity, Superplasticity.

The article discusses the effect of preliminary high-temperature homogenization annealing on the microstructural changes in alloy 1933 and their correlation with the superplasticity and microsuperplasticity of the alloy. The research shows that annealing of alloy 1933 at 520 °C for 2 h leads to the dissolution and melting of the (-phase particles (MgZn2), T-phase particles (Mg3Zn3Al2), and S-phase particles (Al2CuMg), which are present in the initial microstructure of the alloy. The annealing results in a redistribution of the crystallographic orientations of the crystallites of the (-solid solution based on aluminum and the removal of internal microstresses in the volume of the alloy. It is found that preliminary heat treatment slightly affects the mechanical behavior of alloy 1933 under conditions of superplastic deformation. Fibrous structures, the process of the formation and development of which is called microsuperplasticity, are observed both in the samples that have not undergone preliminary homogenization annealing and in the annealed samples. The concentration of Mg atoms in the fibers is higher than their average concentration in the alloy. At the same time, the concentration of Zn and Cu atoms in the fibers is almost two times lower than their concentration in the alloy. The authors propose the mechanism of fiber formation and development, where fiber nucleation is caused by viscous flow of the material formed by melting of (-magnesium enriched solid solution based on alumina, and further fiber growth is carried out by the complex of deformation mechanisms operating during the superplastic flow of the alloy.

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