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Portevin–Le Chatelier effect



The Portevin–Le Chatelier effect describes a serrated stress-strain curve, which some materiels exhibit as they undergo plastic deformation.

This effect occurs, when solute atoms (e.g C in steels) have sufficient mobility and thus can segregate at a dislocation core. Because these positions are energetically favorable, these atoms lock the dislocation i.e. a larger force (and therefore stress) is necessary to move the dislocation. As the dislocation is torn away from the solute atoms, the stress in the stress-strain curve drops. Since this process can happen several time, it leads to serrations in the curve.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Portevin–Le_Chatelier_effect". A list of authors is available in Wikipedia.
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