Comment on Scaling Behavior of the Portevin– Le Chatelier Effect in an Al-2.5% Mg Alloy

Raghavan, Rajesh S and Ananthakrishna, G (2006) Comment on Scaling Behavior of the Portevin– Le Chatelier Effect in an Al-2.5% Mg Alloy. In: Physical Review Letters, 97 (7). 079601-1.

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Abstract

Recently Barat et al. [1] reported results of a scaling analysis using standard deviation (SD) and diffusion entropy(DE) analysis [2] of the stress-time series obtained from Al-Mg alloys deformed over a range of strain rates where the Portevin–Le Chatelier effect (PLC) is seen. The authors claim that the overall dynamics of the PLC effect follows a Levy-walk property in contrast with the chaotic or self-organized critical (SOC) dynamics reported earlier [3]. We show that this incorrect conclusion is an artifact of improper time series analysis. For constraints of space, we discuss results on SD analysis only.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to the American Physical Society.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	16 Nov 2006
Last Modified:	19 Sep 2010 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/8623

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