AUTOWAVE DESCRIPTION OF THE LUDERS AND PORTEVINLE CHATELIER PHENOMENA

The kinetics of Chernov-Luders and Portevin-Le Chatelier deformation processes at the yield plateau in an aluminum-magnesium alloy is analyzed. It is established that the deformation is localized in moving deformation fronts. In general, the movement of the fronts proceeds discretely and only in the...

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Bibliographic Details
Published in:Russian physics journal 2022-12, Vol.65 (8), p.1411
Main Authors: Danilov, V.I, Zuev, L.B, Gorbatenko, V.V, Orlova, D.V, Danilova, L.V
Format: Article
Language:English
Subjects:
Analysis
Magnesium alloys
Testing equipment
Online Access:Get full text
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Summary:The kinetics of Chernov-Luders and Portevin-Le Chatelier deformation processes at the yield plateau in an aluminum-magnesium alloy is analyzed. It is established that the deformation is localized in moving deformation fronts. In general, the movement of the fronts proceeds discretely and only in the phase of abrupt unloading of the sample. Continuous movement of deformation fronts is possible if the rate of recovery of the operating stresses applied by test device is greater than or equal to the rate of stress decline controlled by internal processes at a lower structural-scale level. The kinetics of the motion of deformation fronts, both in the Chernov-Luders and Portevin-Le Chatelier processes, can be described within the autowave concept of plastic flow, and the fronts themselves represent excitation autowaves. Keywords: Chernov-Luders instability, Portevin-Le Chatelier effect, abrupt deformation, deformation fronts, excitation autowaves. UDC 539.213:669.017
ISSN:1064-8887
DOI:10.1007/s11182-023-02784-9