This article is cited in 1 paper

Metals

Nonlinear dynamics of an individual Portevin–Le Chatelier deformation bands

A. A. Shibkov, A. E. Zolotov, M. F. Gasanov, A. A. Denisov, R. Yu. Kol'tsov, S. S. Kochegarov

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

Abstract: Based on high-speed studies of the dynamics of Portevin–Le Chatelier ambryo bands with a temporal resolution of up to 20 $\mu$s and a spatial resolution of up to 10 $\mu$m/px, their classification is proposed, which includes four types of bands depending on the nature of interaction with other bands and the sample surface (using the example of a polycrystalline aluminum-magnesium alloy). It has been found that all types of ambryo bands demonstrate nonlinear dynamics with a sharp acceleration of the band tip and the growth rate of its volume at the final stage before reaching the sample surface. A phenomenological model of the nonlinear growth of the ambryo band is proposed, which explains the exponential self-acceleration stage observed experimentally. The sharp absorption of acoustic noise at the stage of accelerated band growth is discussed.

Keywords: nonlinear dynamics, Portevin–Le Chatelier effect, deformation ambryo bands, acoustic emission, dislocation mobility, aluminum-magnesium alloy.

Received: 08.07.2022
Revised: 08.07.2022
Accepted: 09.07.2022

DOI: 10.21883/FTT.2022.11.53311.429

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