Laminated Structure in Recrystallized Aluminium

Abstract

BY electron microscope studies of alumina replicas taken by well-established methods¹ from specimens of recrystallized aluminium we have observed a fine laminated structure (Fig. 1.). This has a mean spacing of approximately 600 A., from which variations do not exceed 100 A. The laminations themselves appear to have a nodular structure which is very clear in the example of Fig. 1, although the nodules are not always so clearly resolved. The general direction of the laminations over a wide field is constant ; but over small distances (of the order of 15,000 A.) the direction varies two or three degrees from this. This laminated structure differs from those previously observed in metal crystals by Straumanis² and Graf³, which have spacings of the order of 10,000 A.