Hongwei Gu

Influence of Hot Rolling on Cube Texture of Ni Substrate for Coated Conductor

Abstract Pure Ni and Ni alloy tapes with sharp cube texture and low-angle grain boundaries prepared by thermomechanical process were extensively used as substrates for coated conductor. The thermomechanical process usually includes hot forging and cold rolling. In this study, a hot-rolling process between hot forging and cold rolling was induced. The influence of hot rolling on the cube texture of pure Ni was discussed. Sharp cube texture on pure Ni was obtained by suitable hot rolling, cold rolling, and recrystallization treatment. This deformation texture of tape was studied using orientation distribution function (ODF). Orientation mapping, content of the cube texture, and grain boundary distribution were performed using an EBSD system mounted on LEO-1450 SEM. The results show that the substrates that are hot rolled have a sharp cube texture and low-angle grain boundaries.

Epitaxial CeO2/MgO buffer layers on cubic textured Ni substrates for superconducting tapes

Abstract Reported here is a novel epitaxial buffer layer configuration combined with MgO and CeO 2 on biaxially texture Ni substrates for high temperature superconducting (HTS) tapes. The hetero-epitaxial CeO 2 /MgO/Ni structure was grown by magnetron sputtering method. After formation of the buffer layers, θ-2θ and Φ scans of x-ray diffraction were used to measure the film in-plane and out-plane orientation, respectively. The deposited CeO 2 and MgO buffer layers showed good in-plane alignment.