On the characteristics of Portevin–Le Chatelier bands in aluminum alloy 5182 under stress-controlled and strain-controlled tensile testing

The Portevin–Le Chatelier effect: a review of experimental findings

“…He recognized the NSRS as a condition for repeated yielding or a serrated flow, which is a decrease in the flow stress with an increase in the applied strain rate [8,48,55], or vice versa. Later this decrease in the band velocity with increasing stress rate was observed for various alloys by numerous researchers [118,124]. The dependence on temperature and strain rate has been studied rigorously, and all observations have shown that the serrated flow of a particular metal occurs at particular strain rates in combination with suitable temperatures [7,8,[135][136][137][138], a feature that many authors have directly connected to the matching of the mobility of solutes with that of dislocations [7,138,139].…”

“…The temperature regime of the PLC effect expands noticeably towards higher temperatures as the test machine becomes softer [124]. For instance, it increased from <120…”

“…For example, Abbadi et al [124] found that at a particular strain rate and temperature, the tensile test curves had serrations for unpolished aluminum alloy specimens but were perfectly smooth for specimens polished to 3000 grit or more. It has been reported that the rolling of metal sheets increases their surface roughness and that the surface defects induced by rolling increase the local stress and can induce the nucleation of PLC bands.…”

“…Abbadi et al [124] and Kumar et al [126] have independently observed that the temperature and strain rate ranges over which the PLC effect occurs widen and the domains shrink with increasing loading rate. Under a constant strain rate, the hopping type B bands propagate continuously in soft machines [88], as do type C bands tested with hard machines.…”

Temperature Dependence of the Dynamics of Portevin-Le Chatelier Effect in Al-2.5 Pct Mg Alloy

“…Many investigators reported the changes in the mechanical properties such as yield stress, ductility, critical strain etc. with temperature in different Aluminum alloy systems [11][12][13][14]. Variation of strain rate sensitivity with temperature is also reported [15].…”