Abstract
The effect of Fe or Si on the recrystallization phenomena of sheets, cold-rolled from slab ingots without hot-rolling, was investigated. The results obtained may be summarized as follows: (1) The form of compounds in ingots changes considerably by heating at 500°, in the case of 99.6% Al, i.e. long and slender compounds were cut into pieces and rounded off at the corners. In the case of 99.99% Al, by addition of Fe the grain boundary becomes clearer with the heating hours of the ingots but when Si only is added or Si coexists with Fe, a similar tendency takes place. (2) The recrystallized micrograin becomes coarser in size and its temperature higher with the heating hours of ingots in the former. On the otherhand, in the latter the recrystallization temperature becomes lower and the grain finer insize with the heating hours of ingots by addition of Fe. When Si is added or Si coexists with Fe, a similar phenomenon as the former takes place. (3) In 99.99% Al, when Si is added to specimens containing constant Fe and heating hours of ingots are so longer, the recrystallization temperature becomes higher and its grain finer in size.
