Influence of phase composition on Portevln-Le Chatelier effect in Al-Mg alloys

摘要

The temperature-strain rate domain of the Portevin-Le Chatelier(PLC)effect has been determined for three ultrafine grained aluminum alloys:Al-3Mg(Al),Al-4,57Mg-0,35Mn-0,2Sc-0,09Zr(A2)and Al-5,4Mg-0,52Mn-0,lZr(A3)(wt.%).The apparent activation energy of the serrated yielding was estimated.It was found that the presence of dispersed particles leads to a decrease in the activation energy and the temperature-strain rate domain of the PLC effect becomes narrower.