Development of Sharp {011}⟨211⟩ Textured Silver Substrate for Superconducting Tapes

Abstract

Texture formation in pure silver was investigated in order to obtain sharply Brass f011gh211i type textured silver sheet that can be used as a substrate for Y-123 superconducting coated tapes without any buffer layers.The feature of recrystallization texture after the two-step annealing appeared as two peaks close to Goss f011gh100i orientation and Brass f011gh211i orientation respectively with other weak components along -fiber in specimens rolled at room temperature, and only one peak close to Brass f011gh211i orientation with weak components limited to cube orientation, rotated cube orientation and orientation close to Copper f112gh111i orientation in those warm rolled at 150 C. By using the improved metallurgical processing, a very sharp Brass f011gh211i type texture has been successfully realized in specimen, which was cast in vacuum, warm rolled by 92% at 150 C and subsequently annealed as 200 C-20 min + 800 C-180 min in nitrogen. There are some critical conditions on the formation of sharp Brass f011gh211i type recrystallization texture: a low oxygen content in the starting material, elevated rolling temperature, and the selection of lower primary recrystallization temperature of two-step annealing process.