Study of the Effect of Purity of Zinc on its Properties (3rd Report). Study on Secondary Recrystallization of Cold-rolled Zinc

Abstract

Recrystallization phenomena have been observed on variously cold-rolled high purity zinc, and the following results were obtained: Abnormal growth is observed in every grades of zinc heated at temperatures higher than 200∼300°. Secondary recrystallization occurs at lower temperature with increasing cold rolling reduction and this phenomenon is also recognised in specimens already completing the primary recrystallization under the same conditions. The sizes of the secondary recrystallized grains are strongly influenced by the heating rate. By rapidly heating to above 300°, secondary recrystallization produced a relatively fine-grained structure, and slow heating produced a large-grained structure. It is also considered that the nucleation of secondary recrystallization would be influenced by the heating rate And secondary recrystallizaiton seems to be occasioned by nucleation and growth, because its character closely resembles that of primary recrystallization.