Three dimensional grain size distribution during grain growth in aluminum

The distribution of three dimensional grain size has been directry measured during grain growth of pure aluminum by the special method of separating and weighing individual grains, which was used by Rhines and Patterson. It is concluded in consideration for the limit of measurabilitiy that the observed grain size distribution is approximately log normal for all specimens, and its spread does not vary remarkably during grain growth in this experiment. The grain size distribution from the computer simulation of grain growth by Exxon group is shown to be closer to the present experimental result than that from the representative theory of grain growth by Hillert, which is attributed to the fact that the former deals with growth or shrinkage of the individual grains while the latter growth of an isolated grain in an average environment.