Comparative study of the Portevin-Le Chatelier effect in interstitial and substitutional alloy

TL;DR

This study investigates the Portevin-Le Chatelier effect in interstitial low carbon steel and compares its complex chaotic dynamics to a substitutional alloy, revealing greater complexity in the interstitial alloy.

Contribution

It provides a comparative analysis of the PLC effect in interstitial versus substitutional alloys using nonlinear dynamical methods, highlighting differences in their chaotic behavior.

Findings

Presence of marginal deterministic chaos in low carbon steel

More complex PLC dynamics in interstitial alloy compared to substitutional alloy

Differing stress time series behaviors between the two alloy types

Abstract

Tensile tests were carried out by deforming polycrystalline samples of an interstitial alloy, low carbon steel at room temperature in a wide range of strain rates where the Portevin-Le Chatelier (PLC) effect was observed. The observed stress time series data were analyzed using the nonlinear dynamical methods. From the analyses, we could establish the presence of marginal deterministic chaos in the PLC effect of the low carbon steel. Moreover, we made a comparative study of the PLC effect of this interstitial alloy with the substitutional Al-Mg alloy which shows that the dynamics of the PLC effect in the interstitial alloy is more complex compared to that of the substitutional alloy.