日本金属学会誌

J. Japan Inst. Metals, Vol. 28, No. 12 (1964),
pp. 809-814

Transmission Electron Microscope Study of the Deformation Twin in Silicon Iron

Zenji Nishiyama1, Ken'ichi Shimizu1 and Akio Kamada2

1Institute of Scientific and Industrial Research, Osaka University, Sakai
2Research Laboratory of Kawasaki Steel Co., Kobe

Abstract:

The fine structures of deformation twins in 3%Si-Fe have been investigated by transmission electron microscopy and selected-area electron diffraction. In the inside of the twins, whose width was generally of the order of several microns, dislocations appeared to be straight and of good directionality in contrast to those in the matrix. The twin boundaries were usually crowded with a number of dislocations. It is the most interesting that there was occasionally found a mid-rib in the twin, as in the martensite crystal. This mid-rib was found to be an extremely thin plate parallel to a {112} twinning plane and composed of tangled dislocations and dislocation loops of high density. In some cases the mid-rib was observed as a small angle boundary. Dislocation pile-ups in the twin were found on the {110} slip planes of the twin. On the twin boundary indentations were frequently found and they had the isosceles triangular shape, two edges of which were allways parallel to the slip planes.
All of the above phenomena are considered to be associated with the formation mechanism of the deformation twin.


(Received 1964/7/1)

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