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Portevin–Le Chatelier effect
The Portevin–Le Chatelier effect (PLC) describes a serrated stress-strain curve or jerky flow, which some materials exhibit as they undergo plastic deformation, specifically inhomogeneous deformation.〔Van Den Beukel, A. (1975)“Theory of the effect of Dynamic Strain Aging on Mechanical Properties” Phys. Stat. Sol. (a) 30, 197〕 This effect has been long associated with dynamic strain aging or the competition between diffusing solutes pinning dislocations and dislocation breaking free of this stoppage.〔Abbadi, M., Hahner, P., Zeghloul, A.(2002) “On the characteristic of Portevin-Le Chatelier band in aluminum alloy 5182 under stress controlled and strain- controlled tensile testing” Materials Science and Engineering A337: 194-201〕
The onset of the PLC effect appears when the strain rate sensitivity becomes negative and inhomogeneous deformation starts.〔 This effect also can appear on the specimens surface and bands of plastic deformation. This process starts at a so-called critical strain, which is the minimum strain needed for the onset of the serrations in the stress-strain curve. The critical strain is both temperature and strain rate dependent.〔 The existence of some critical stain are attributed to better solute diffusivity due to the deformation created vacancies and increased mobile dislocation density. Both of which contribute to the instability in the substitutional alloys, while interstitial alloys are only effect by the increase in mobile dislocation densities.〔Ananthakrishna, G. (2007)“Current theoretical approaches to collective behavior of dislocations”, Physics Reports 440:113-259〕
==Conditions that affect the PLC effect==
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