Investigation of Portevin-Le Châtelier effect during Erichsen test

Portevin-Le chatelier effect

Aluminum subjected to smooth mechanical loading does not often deform in a correspondingly smooth manner. Typically it deforms inhomogeneously through the propagation of deformation fronts that slowly traverse the sample. These are called Portevin-Le Chatelier fronts; what determines their velocity has been somewhat mysterious. We present a phenomenological theory for deformation fronts that ce...

Portevin–Le Chatelier effect in an aluminum alloy

Investigation using digital image correlation of Portevin-Le Chatelier Effect in Hastelloy X under thermo-mechanical loading

http://dx.doi.org/10.1016/j.ijplas.2014.09.001 0749-6419/ 2014 Elsevier Ltd. All rights reserved. ⇑ Corresponding author. Tel.: +1 217 333 2242; fax: +1 217 244 0720. E-mail address: [email protected] (J. Lambros). 1 Present address: Applied Materials Inc., Sunnyvale, CA, United States. 2 Present address: Intel Corporation, Hillsboro, OR, United States. B. Swaminathan , W. Abuzaid , H. Sehit...

Effect of Heat Treatment on the Portevin-Le Chatelier Effect of Al-2.5%Mg Alloy

An experimental study is presented on the effect of microstructural change on the Portevin-Le Chatelier effect behaviour of Al-2.5%Mg alloy. Tensile tests are performed on the as received and heat treated (at 400 oC for 16 hours) samples for a wide range of strain rates. The serrations observed in the stress-time curve are investigated from statistical analysis point of view. Microstructures of...

Critical dynamics of burst instabilities in the Portevin-Le Ch atelier effect.

We investigate the Portevin-Le Châtelier effect (PLC), by compressing Al-Mg alloys in a very large deformation range, and interpret the results from the viewpoint of phase transitions and critical phenomena. The system undergoes two dynamical phase transitions between intermittent (or "jerky") and "laminar" plastic dynamic phases. Near these two dynamic critical points, the order parameter 1/ta...