Warm Deformation of Alloy Al – 4.7% Mg – 0.32% Mn – 0.21% Sc – 0.09% Zr
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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.
Key wordsaluminum alloys warm deformation microstructure transmission electron microscopy mechanical properties
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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