Abstract
The distribution of stray-grains present on the surface of cylindrical zone-refined iron single-crystals has been studied by means of optical microscopy. Stray-grains are observed on crystals of all orientations, except on one crystal which has a [001] growth axis. Several arrays of grains parallel to the growth axis of a parent crystal are observed along the line of tangency of {100}, {110}, {111} or {211} planes. Many twins are identified by means of X-ray diffraction. In all studied cases, a {211} twinning plane is nearly perpendicular to the surface. This condition is less drastic than the one proposed by Saleeb and Kadečková, according to which nucleation takes place only when a {111} plane is parallel to the surface. The condition proposed here applies to isolated grains as well as to arrays. It explains that twins corresponding to several systems may occur on the surface of a single-crystal. Since the number of actually observed arrays is lower than the theoretical one, it is supposed that localized textures could have an influence during the recrystallization process.
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