Abstract
The etch figures were observed on 3% silicon iron sheets which were cold rolled to over 3% reduction, recrystallized, and then etched with 35% aqueous solution of FeCl3 or with 10% aqueous solution of HNO3. We observed that a few to several hundred etch figures crowded about annealing twins, the density of these crowds of etch figures being maximum (10 groups/cm2) approximatly at 5% rolling. A twin crystallite with a cross-section thiner than 1μ×0.1μ and the length over 20 μ was found to correspond to an etch figure by transmission electron microscope observations. It seems, however, that the etch figures were formed by the effect of etching twin boundaries, and it is difficult to interpret the formation of such annealing twins by the conventional models.
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