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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Recently Barat et al.  reported results of a scaling analysis using standard deviation (SD) and diffusion entropy(DE) analysis  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 . 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|
|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|
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