Study On The Cubic Texture Control Of Ni-W Alloy Baseband For Coated Conductor

The second generation YBCO materials has much potential to develop in many fields, such as electricity, transportation, energy, and magnetic technology ext. It can be applied to Maglev train with excellent magnet properties of Superconducting material; high-temperature superconducting material at temperatures down to about the critical temperature when the resistance is reduced to zero, this feature can be used in power plants and other superconducting tapes power transmission field; the use of superconducting materials superconducting tunnel effect, it can be applied to the highly sensitive detection of electromagnetic signal components, manufacturing SQUID magnetometer.Currently NiW alloy coating baseband use rolling assisted biaxially textured technology (RABiTS) has been able to achieve commercialization basic requirements. However, the current mainstream of Ni-5at.% W alloy base magnetic tape is large, low strength, which greatly limits the application field of the coating of the superconducting tape. In this thesis, the superconducting tape coating hotspot, proposed solutions NiW alloy baseband insufficient strength magnetic larger ideas and programs. Studies have shown that increasing the content of alloying elements in the base band in W, can effectively reduce the magnetic material and significantly improve the mechanical properties of the base band. But the attendant problems are stacking fault energy materials decreased after large deformation of the rolling, stacking fault energy is reduced leading to the occurrence of twinning dislocation slip is blocked, thereby changing the orientation of the baseband microscopic grains subsequent re after crystallization can not be treated with higher levels of biaxial cube texture. So, how to improve the content of W, while inhibiting the occurrence of twins, ensure biaxial cube texture content has become a problem to be solved in this paper.In this paper, prepared by vacuum induction melting technology Ni-7.5at.% W alloy billets, after which a small amount of deformation of the multi-pass rolling, the amount of control over every pass the 5% deformation, deformation rolling final total is greater than 95%. Recrystallization process using different heat treatment process, analyze the effects of different temperature, holding time, the two-step annealing on cube texture content. In this paper, the use of innovative multi-pass cold rolling process by adding a low temperature recovery process, trying to reduce the incidence of twins. Cold-rolling the initial billet and recrystallization treatment, cold rolling once again recrystallized. This two cold-recrystallization process is based on the formation of recrystallization texture theory of nucleation theory and orientation selective growth theory. In the cold rolling after the first recrystallization, the billet will be a certain content of cube texture grains, after this billet then processed through rolling assisted biaxially textured technique, cube texture will show selective growth case, the orientation of the cube texture has been formed to continue to grow. So that you can get higher levels of biaxial cube texture. Experimental use of optical microscopy analysis section (OM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and other equipment, rolled alloys baseband and then micro-crystalline morphology, texture distribution and content, etc. analyze the comparison. In this paper, by studying cube texture of high alloy content W baseband configuration control, providing a theoretical basis and experimental data for high-temperature superconducting tapes coating industrial production.