A. Razaghian, T. Chandra2,
Volume 4, Issue 1 (6-2007)
Abstract
Abstract: Static recrystallization (SRX) behavior of a composite based 7075 Aluminum alloy
reinforced with SiC particles was studied during annealing the deformed samples at high
temperatures. The results showed an absence of SRX in the samples annealed after hot working at
the same deformation temperature, however, a rise in annealing temperature of 100-1500 C above
that the deformation temperature led to full recrystallization. This can be ascribed to the relatively
moderate dynamic recovery and the presence of dispersions which stabilize the substructure.
Particle stimulated nucleation (PSN) had a significant effect on the grain size in deformed samples
at low temperature, but no PSN was observed in samples strained at high temperatures. The
possible cause might be that at high temperature the dislocations can be annihilated by climb
process around the particles together with the absence of deformation zone for nucleating the
recrystallization.
