Abstract
The electro-deposited pure iron has a quite sharp and isotropic 〈111〉//ND fiber texture and needle shaped grain elongated in ND. This pure iron shows the r-value over 7 and it is difficult to explain such a high r-value only from the texture. In this study the deformation behavior of the electro-deposited pure iron was investigated to reveal the mechanism of the extremely high r-value. The slip lines on the surface after the deformation indicated that the particular {110} plane slips which are parallel to ND exclusively act in the specimen. The tensile deformation by this slip system does not need the thickness decrease. Thus the limitation of the active slip system is the main cause of the extraordinary high r-value. One possibility of the limitation is the ease of the continuity of the slip plane of the adjacent grains. Because both {110} slip plane and grain boundary are perpendicular to the surface, the slip planes of adjacent grains can connect easily.
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