Deformation Twin in Single Crystals of a 3% Vanadium-Iron Alloy

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Observations were made on deformation twins in single crystals of a 3% vanadium-iron alloy which were deformed in compression along the [1^-110] direction at -195℃. In most twin bands, a narrow but straight line ('midrib') is seen to run along the longitudinal direction. Electron microscope observations show that the thickness of such a 'midrib' is less than 100 Å and also, near the midrib, a considerably high density of dislocations is located. The midrib runs straight without being disturbed by sub-boundaries, where twin bands are always constricted. Besides such 'constrictions', 'indentations' are frequently observed in a twin band, which are interpreted as regions left untwinned locally in the growth process of thickness because of the presence of isolated obstacles. These observations may suggest that a deformation twin is formed by the following two processes. A very thin twin plate less than 100 Å in thickness is first formed dynamically, and then the thickness of the twin increases with increasing stress, forming constrictions or indentations at the place of obstacles such as sub-boundaries, pre-cipitates, or pre-existing dislocations.
社団法人応用物理学会の論文
1966-10-15