Influence of the non-monotonic loading and short stops on the regularities of the jerky flow in the Al-Mg alloy

Abstract

The aim of the paper is to investigate the influence of the non-monotonic loading and short stops on the spatial-time inhomogeneity due to the jerky flow in the Al-Mg alloy. Experimental study on the regularities of inhomogeneous deformation and the processes of macroscopic localization of the plastic flow due to the Portevin-Le Chatelier effect was carried out. Using the digital image correlation technique the data on the initiation and propagation of the strain bands were obtained. Experimental data were obtained that show the effect of short-term stops and non-monotonic loading on the regularities of inelastic deformation of the Al-Mg alloy when the PLC effect manifests itself. Short stops decrease the level of critical strain when the jerky flow starts. Non-monotonic tests led to a change in the type of the PLC effect and a change in the regularities of the spatial-time inhomogeneity of plastic flow.