Physics of the Solid State
Dynamic hardness and formation of Portevin-Le Chatelier bands during impact indentation
Shibkov A. A.1, Zolotov A. E.1, Denisov A. A.1, Gasanov M. F.1, Shibkov E. A.1, Kochegarov S. S.1
1Tambov State University, Tambov, Russia
Email: shibkovaleks@mail.ru
The effect of shock indentation on the formation and propagation of the Portevin-Le Chatelier deformation bands in an aluminum-magnesium alloy was studied experimentally using acoustic emission and high-speed video recording methods. Dynamic and nonlinear responses to shock indentation are revealed: the first include high values of dynamic hardness and local strain and loading rates, and the second - threshold and multiple nature of force and acoustic responses. It is shown that the bands of macrolocalized deformation represent a latent bulk type of erosion damage, which reduces the mechanical stability and durability of the alloy. Keywords: contact shock, Portevin-Le Chatelier effect, deformation bands, fracture, aluminum-magnesium alloy.
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