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Vol.18, No.3, 261 ~ 271, 1980
Title
Effects of Free Surface on Recrystallization and Grain Growth of Aluminum
김영호Young Ho Kim, 이동녕Dong Nyung Lee
Abstract
A study has been made of the effects of a free surface on recrystallization and grain growth of super-purity aluminum. Aluminum was cold rolled to the reduction of 75 percent and isothermally annealed in a salt bath. The cold worked surface layer was removed by electropolishing prior to annealing to avoid complications due to inhomogeneous deformation in the surface layer. The free surfaces of polycrystal specimens were found not to be a specially preferred site for the nucleation of recrystallization, and fractions of recrystallized part and grain size in the surface layer differed little from those in the bulk. However when specimens were annealed for long at higher temperatures, the grain size near the surface was slightly finer than that in the bulk. The isothermal grain growth kinetics satisfied the expression of D=ktⁿ where n was found to vary from 0.07 to 0.14 with increasing temperature. The secondary recrystallization or exaggerated grain growth occurred near the surface layer in spite of the superpurity of aluminum. The exaggerated grain growth seemed to be associated with an inhibition of grain growth by surface grooves and sudden growth of some grains.
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