I have collected results obtained for a series of aluminum alloy AA3004. Based on the analisys of EBSD/SEM maps I could draw the following conclusions:
- microstructure of AA3004 alloy subjected to severe plastic deformation (ECAP A6x) and then annealed for 1 hour retain homogeneity up to about 250°C and ultra-fine grain structure. The average grain size below 1 micron is kept up to about 270°C. The most unfavorable microstructure has an alloy annealed at 300°C;
- Number of LAGB and HAGB decreases with increasing annealing temperature which is related to the grain growth. For temperature lower than 300°C, in the microstructure are dominating HAGB and above it their amount is kept constant and the difference between HAGB and LAGB is not as significant;
- The nature of the changes of average dezorientation for HAGB and LAGB as a function of annealing temperature is independent of each other.