Study of the Effect of Purity of Zinc on its Properties (2nd Report). Effect of Purity on the Recrystallization Phenomena

Abstract

Recrystallization phenomena have been studied with 4 kinds of specimens (99%, 99.9%, 99.99%, 99.99%Zn). The results were as follows: (1) The higher the purity, the larger the grain size of primary recrystallization. (2) In 99.999%Zn, primary recrystallization is partially observed immediately after 10% cold-rolling, and is completed after 30% cold-rolling. (3) Secondary recrystallization occurs at a low temperature with increasing cold-rolling reduction. (4) At the same cold-rolling reduction rate, it was found that there exists a minimum point of secondary recrystallization temperature at 99.99% purity. (5) In recrystallization diagram of zinc specimens of higher purity than 99.9%, it was found that the grain size has the maximum value at a certain temperature.