日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 11 (1957),
pp. 658-661

Studies on Line Structures and Conditions for the Growth from the Melt of Single Crystals of Nickel (1st Report)

Hideo Takagi, Shigeo Maeda and Yasuto Nakai


Abstract:

In the course of growing single crystals from nickel melt by the Bridgman method,it was found that the distance from the seed crystal to the starting point of a stray crystal, which was generally nucleated on the inner wall of the porcelain tube (alundum), depended on the lowering speed. Furthermore, the critical lowering speed necessary for producing single crystals of 10 cm in length decreased with the increase of the angle between the [001] direction and the specimen axis. The so-called cell structure was observed on the top free surface of the single crystal rods. This structure was divided by ditches into square or rectangular cells in the specimens grown in the directions of [001] and [101],as in the case of Rosi's observation on the copper single crystals. The line structure was observed on the side surface and the cell structure on the cross sectional surface by electrolytical etching method. A relation between the spacing of the line structure and the lowering speed was found in the case of the [001] direction.


(Received 1957/7/8)

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