Abstract
Recrystallization of cold worked aluminium plates was studied in terms of the rate of growth of a recrystallized grain. The rate was measured by means of the method, employed by Anderson and Mehl, with slight modification. The measurements were carried out at 296∼622° for pure aluminium plates (99.995%) of various initial grain size which have been elongated 1.2∼15%. The results obtained are as follows: (1) Rate of growth of a recrystallized grain decreases with the progression of the isothermal recrystallization. It is pronounced in specimens with rather small intial grain for small amount of elongation. (2) There are important relations between the rate of grain growth and the initial grain size, that is the driving force of the grain boundary migration in the course of recrystallization is a function of (l+c)⁄D, at a lower temperature than 530°, and of l⁄D at the higher than this, approximately. Here l is the degree of elongation, C a constant with magnitude of 1.02%, D the average diameter of initial grains. (3) The relation of logv vs. 1⁄T does not reveal a straight line but a curve concaved to the lower. Lower than 400°, the curve would be approximated by a straight line, but it has a more moderate tangent than those of Anderson and Mehl.
