Research on Static Recrystallization Microstructure Evolution of Super High-purity Silver

The super high-purity silver ingot(Purity99.999%)prepared by vacuum induction melting,then treated by cold rolling with various deform ratio incorporated with subsequent annealing at different heat treatment,the effects of various deform ratio and annealing methods on the recrystallization behavior are studied.The results revealed that,the initiation temperature of recrystallization of super high-purity silver was low the recrystallization started while annealing at 100℃for 5min.It also indicated that the recrystallization rate in super high-purity silver is very high,samples recrystallized completely as annealing at 200℃ with 5min.With the increasing of deformation amount,the size of recrystallized grains is gradually refined.The cold-rolling samples with 85%deform ratio have better uniformity.The reasonable annealing process of super high-purity silver is 150℃ with 1-2h.