DEFORMATION ZONE GEOMETRY AND TEXTURE GRADIENTS IN COLD-ROLLED NIOBIUM.

Abstract

Niobium plates were cold-roilled at room temperature to a total reduction of 60% maintaining the geometry of the zone of deformation constant for each plate. Pole figures were obtained by means of the Schulz x-ray relfection technique from various depths in the thickness direction for plates rolled with different DELTA , the ratio of the mean height of the deformation zone to its contact length. Severe texture gradients were noted and characterized for DELTA greater than 1; a modified texture different froim the normal texture was obserbved at intermediate through-the-thickness locations.