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 {011} (211) 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 {011}(100) orientation and Brass [011] (211) orientation respectively with other weak components along α-fiber in specimens rolled at room temperature, and only one peak close to Brass {011}(211) orientation with weak components limited to cube orientation, rotated cube orientation and orientation close to Copper {112}(111) orientation in those warm rolled at 150°C. By using the improved metallurgical processing, a very sharp Brass {011}(211) 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 {011}(211) 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.