The evolution of the structure and mechanical properties of sheets from alloy Al – 4.7% Mg – 0.32% Mn – 0.21% Sc – 0.09% Zr during warm rolling and subsequent annealing is studied. It is shown that extended fibers with a thickness of 50 – 100 nm form inside the deformed grains in the rolling process. Post-rolling annealing of the sheets at 150 and 200°C results in substantial lowering of the elongation after a hold for 3 h; then the ductility recovers after a hold for 5 h. The lowering of the ductility is associated with precipitation of a fine β -phase over grain boundaries during the annealing. The phase grows and its volume fraction decreases when the annealing time is prolonged. The possibility of formation of high-level mechanical properties after warm rolling and subsequent annealing is shown.
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The work has been performed with support of the Ministry of Education and Science of the Russian Federation within State Provision No. 11.7172.2017/BCh for higher educational organizations.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 20 – 25, July, 2019.
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Pozdnyakov, A.V., Barkov, R.Y., Yakovtseva, O.A. et al. Warm Deformation of Alloy Al – 4.7% Mg – 0.32% Mn – 0.21% Sc – 0.09% Zr. Met Sci Heat Treat 61, 416–420 (2019). https://doi.org/10.1007/s11041-019-00439-6
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DOI: https://doi.org/10.1007/s11041-019-00439-6