1994 Volume 58 Issue 10 Pages 1103-1112
The effects of the presence, amount and difference in distribution of bubbles in a material and the grain boundary mobility on the time law of normal grain growth are investigated using a Monte Carlo computer simulation technique. The simulation evolves the microstructure with a mixed grain size when the bubbles are nonuniformly distributed or when the microstructure consists of grain boundaries with a different mobility in the absence of bubbles. The presence of bubbles causes the time exponent for grain growth n(=dlogD⁄dlogt) to increase from 2.5 to 2.9-3.8, retarding the grain growth. However, n is not affected very much by the difference in the distribution of bubbles. It becomes clear that the width of grains represents the dependence of 1⁄f and 1⁄\sqrtf on the area fraction of bubbles f only when the individual bubbles or the arrays of bubbles are randomly distributed, respectively.
