The dynamic recrystallization behavior in Al-Mg alloys

Abstract

The influence of phase composition on the behavior of dynamic recrystallization in alloys Al-3Mg (A1), Al-4.57Mg-0.35Mn-0.2Sc-0.09Zr (A2) and Al-5.4Mg-0.52Mn-0.1Zr (A3) (wt.%) during the equal-channel angular pressing (ECAP) was studied. The ECAP processing of alloy A1 resulted in a partially recrystallized microstructure with the mean size of coarse and fine grains of 20 and 1.4 μm, respectively In contrast, the formation of fully-recrystallized microstructure was observed in the alloys A2 and A3. The mean grain sizes in the alloys A2 and A3 were 1.1 and 1.5 μm, respectively. The hardness values in the alloys A2 and A3 after ECAP processing were increased by about 30% more than those in the alloy A1. This may be attributed to the presence of Al6Mn and Al3(Sc,Zr) particles.