Mechanical properties, strength physics and plasticity

Dynamic hardness and formation of Portevin–Le Chatelier bands during impact indentation

A. A. Shibkov, A. E. Zolotov, A. A. Denisov, M. F. Gasanov, E. A. Shibkov, S. S. Kochegarov

Tambov State University named after G.R. Derzhavin, Tambov, Russia

Abstract: 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.

Received: 22.02.2023
Revised: 22.02.2023
Accepted: 01.03.2023

DOI: 10.21883/FTT.2023.04.55296.23

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