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
Email: ad.evstifeev@gmail.com

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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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