  The scaling behavior of the Portevin-Le Chatelier (PLC) effect is studied by
deforming a substitutional alloy, Al-2.5%Mg and an interstitial alloy, low
carbon steel (0.15%C, 0.33%Mn, 0.04%P, 0.05%S, 0.15%Si and rest Iron) at room
temperature for a wide range of strain rates. To reveal the exact scaling
nature, the time series data of true stress vs. time, obtained during the
tensile deformation (corrected for drift due to strain hardening by polynomial
fitting method), are analyzed by two complementary methods: the standard
deviation analysis and the diffusion entropy analysis. From these analyses we
could establish that in the entire span of strain rates, PLC effect showed Levy
walk type of scaling property.
