Abstract: The possibility of increasing the static and dynamic strength of the aluminum-magnesium alloy AMg4.5 is shown by using methods of severe plastic deformation, a combination of annealing and additional deformation of ultrafine grained alloy. The strength properties of the material are evaluated using a structural-temporal approach to the analysis of experimental data on the dynamic tension of small samples obtained on split-Hopkinson pressure bar. © Pleiades Publishing, Ltd. 2024. ISSN 1063-7842, Technical Physics, 2024, Vol. 69, No. 7, pp. 1950–1955. Pleiades Publishing, Ltd., 2024. Russian Text The Author(s), 2023, published in Zhurnal Tekhnicheskoi Fiziki, 2023, Vol. 93, No. 3, pp. 365–370. English Text Ioffe Institute, 2023.