The nucleation of recrystallization at second phase particles in 7000 series deformed aluminum alloy
An investigation was carried out to determine the effect of a thermomechanical process (TMP) in the precipitation of dispersed second phase particles, and to assess the recrystallization behavior of a deformed ALCANVEN-7475 commercial aluminum alloy. The TMP included solution anneal treatment at Ts = 482°C for 3 hours, overaging at temperatures (To) in the range from 160 - 400°c for 1 to 30 hours, cold and warm deformation up to 90% reduction of thickness (RA) and recrystallization at Tr = 482 °C for 15 to 60 minutes.A Hitachi H-600 TEM operated at 100 KV was utilized to examine the microstructural evolution of the alloy leading to the nucleation of recrystallization as a consecuence of the previously described four steps TMP.It was determined that the nucleation of recrystallized grains is promoted by the presence of second phase particles with critical sizes between 0.5 and 1.0 μm.