Transformation of structure and properties of Al–Zn–Mg–Cu alloy under complex processing. Part. ІI. Phase composition and mechanical properties

Keywords

7075 alloy, twin-roll casting, hot rolling, quenching, aging, phase composition, mechanical characteristics.

Cite as

Pryhunova A. H., Nohovitsyn О. V., Aiupova Т. А., Abolikhina O. V., and Nosko О. А. Transformation of structure and properties of Al–Zn–Mg–Cu alloy under complex processing. Part. ІI. Phase compo­sition and mechanical properties. Physicochemical Mechanics of Materials. 2025. 61(3), 005-013.

https://doi.org/10.15407/pcmm2025.03.005

Abstract

The influence of technological modes in the “twin-roll casting–hot rolling–heat treatment” process on the phase composition and mechanical characteristics of the 7075 alloy (Al–Zn–Mg–Cu system) with the maximum allowable zinc content (6.1 mass%) was investi­gated. It was established that the phase composition remains independent of the processing stages, which affected the size, distribution, volume fraction, and morphology of intermetal­lic compounds, as well as the parameters of the dislocation structure and microstrain of the aluminum solid solution crystal lattice. These factors influence the strength and plasticity characteristics. The maximum ultimate tensile strength (σ_UTS = 568 MPa), while maintai­ning plastic properties (δ ≈7 to 8%), is observed under conditions of five-fold compres­sion, quenching, and artificial aging. The highest relative elongation (δ ≈ 20%) at σ_UTS = 430 to 440 MPa is achieved with 8–9-fold compression followed by quenching and natural aging, which is nearly twice the corresponding value for 7xxx series aluminum alloys produced by conventional technology.

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