Character of the Dislocation Bands in the (A+B) regime of the Portevin-Le Chatelier effect in Al-2.5%Mg alloy

TL;DR

This study investigates the Portevin-Le Chatelier effect in Al-2.5%Mg alloy, revealing that a single dislocation band governs the PLC dynamics and changes character during deformation in a specific strain rate regime.

Contribution

It provides new insights into the dislocation band behavior in the (A+B) regime of the PLC effect in Al-Mg alloy, highlighting the dynamic change of band character.

Findings

A single dislocation band governs PLC dynamics in the (A+B) regime.

The dislocation band changes its character during deformation.

The study clarifies the nature of serrations in stress-strain curves.

Abstract

The Portevin-Le Chatelier(PLC) effect has been investigated by deforming Al-2.5%Mg alloy in the strain rate regime where simultaneously two types (type B and type A) of serrations appear in the stress strain curve. Our analysis reveal that in this strain rate regime the entire PLC dynamics for a particular strain rate experiment is governed by a single band which changes its character during the deformation.