Study of the mechanisms of current-induced suppression of serrated deformation

Abstract

The main results of studying the influence of electric current on the Portevin-Le Chatelier serrated deformation in some commercial aluminum alloys of the Al-Mg, Al-Li-Mg, Al-Zn-Mg-Cu, and Al-Cu systems are reported. It is found that the passage of a low-density (~10-60 A/mm 2 ) dc current leads to the suppression of serrated deformation and band formation in all alloys under study, except for the Al-Cu alloy. Possible mechanisms of this phenomenon are discussed, basically in terms of possible influence of current on the processes of precipitation and dynamic strain aging, which are used to explain the Portevin-Le Chatelier effect.

Structure and mechanism of the deformation of Grade 2 titanium in plastometric studies

“…It can also be assumed that due to structural changes, the serration of the curve is a consequence of Zhang et al [24] and Shibkov et al [25]: hooking and blocking of dislocations and increasing dislocation density (as a result, the strength of their blocking increases).…”