Fine Recrystallized Grain Structure by Dispersion of Eutectics in Al-Fe-Mn Alloy

摘要

Al-1.5 percent Fe-0.5 percent Mn alloy sheet ingot was rolled up to 99.8 percent and annealed at temperatures between 573 and 723K. With increased cold reduction, the mean size and the mean spacing of second phase particles became smaller and the number density of the particles increased. With decreased mean spacing of particles, average grain size became smaller. In case of 99 percent cold rolled samples, the number density of particles larger than 1 mu m was 3 approx 3.5 X 10~4/mm~2 and the mean spacing of these particles was 5 approx 6 mu m. The recrystallized grain size of 4 approx 5 mu m was obtained after annealing above sample at 573K for 300s. With the reduction of grain size from 25 mu m to 4 approx 5 mu m, 0.2 percent proof stress increased from 45MPa to 100 approx 120 MPa by 2 approx 2.5 times.