Experimental study of the Portevin-Le Chatelier effect under complex loading of Al-Mg alloy: procedure issues

Abstract

The aim of this work is to solve the methodological issues of the experimental study of the nucleation and propagation of deformation bands due to the Portevin-Le Chatelier effect under conditions of complex loading. It is of interest to determine the boundaries of unstable plastic deformation of the AMg6 alloy under complex loading conditions. A technique for controlling the loading process with a given rate of deformation intensity of materials has been worked out. Short stops of the loading process and unloading have an impact on the manifestation of the jerky flow. Stops and unloading reduce the strain level at which the diagram starts to manifest the effect Portevin-Le Chatelier. The experimental results show the evolution of inhomogeneous strain fields and local strain rates under conditions of manifestation of jerky flow during tension with torsion tests of Al-Mg alloy samples.

Keywords

• jerky flow
• the portevin-le chatelier effect
• strain field
• plasticity
• digital image correlation technique
• aluminum-magnesium alloy