  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.
