Technical Physics
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Features of dynamic fracture of ultrafine-grained aluminum alloy AMg4.5
Evstifeev A.D.1,2
1Research Institute of Mechanics, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
2St. Petersburg State University, St. Petersburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
Email: ad.evstifeev@gmail.com
The features of the fracture of the aluminum alloy AMg4.5 under dynamic tension according to the Kolsky methods using Split-Hopkinson pressure bar are considered. Experimental and theoretical data of strength characteristics of the alloy in the initial coarse-grained and ultrafine-grained states are presented. It is shown that the high degree of deformation of the material obtained in the process of severe plastic deformation by torsion under high pressure has a negative effect on the dynamic strength of the material. Keywords: dynamic strength, incubation time criterion, Split-Hopkinson pressure bar, severe plastic deformation.
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