This investigation involves a photomicrographic study of the segregation resulting from the eutectic solidification characteristics of aluminum-uranium alloys, ranging from 5 to 30 weight percent uranium. The segregation can occur in either of two manners; the first, due to the gravitational forces acting upon the growing particles which nucleate in the melt and the second, due to the mode and rate of heat transfer through the material. It was found that segregation occurred only as the result of the latter factor due to the small volume of the ingot and the rapid rate of heat transfer. The segregation was measured quantitatively as the amount of primary constituent that was contained in a particular region as compared with another region on the same ingot. It was found that the primary constituent was more concentrated in the top central regions, of the higher percentage uranium alloy, which classifies the segregation as inverse segregation --Abstract, page ii
