STATIC RECRYSTALLIZATION BEHAVIOR OF A SiC - PARTICLE REINFORCED ALUMINUM ALLOY AFTER HOT DEFORMATION

Abstract: Static recrystallization (SRX) behavior of a composite based ۷۰۷۵ 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 ۱۰۰-۱۵۰۰ 􀁱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.

کلیدواژه ها:

Metal matrix composite ، static recrystallization ، particle stimulated nucleation ، grain