Cubic Textured Ni-Cr-Mo-W Alloy Tape and Its Properties
LIU Chenghong1, WANG Jun’an1,2, XIONG Banghui1, ZHANG Zhiquan1, CHEN Jichang1, HE Ying1
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200072; 2 Shanghai Key Laboratory of High Temperature Superconductors, Shanghai 200444
Abstract: Quaternary Ni-7.8at%Cr-1.1at%Mo-1.6at%W alloy was designed based on the requirements of sharp cubic texture, lower Curie temperature and moderate yield strength for the substrate of 2G high temperature superconductor wire. The alloy ingot was prepared by using cold crucible induction levitation melting and a tape with a final thickness of 100 μm was obtained after forging, hot rolling, cold rolling and recrystallization annealing. The recrystallization texture of the alloy tape was characterized by electron back scatter diffraction (EBSD) technology and its magnetic and mechanical properties were also evaluated. The results show that the cubic texture percentage and the small angle grain boundary volume fraction of Ni-7.8at%Cr-1.1at%Mo-1.6at%W alloy tape reach 93.4% and 84.5%, respectively, after heavy cold rolling and two-step annealing. The Curie temperature of the alloy tape is 25 K, far below 77 K, and the yield strength of the alloy tape at room temperature is 182 MPa, equivalent to that of Ni-5at%W alloy tape. All this indicates that Ni-7.8at%Cr-1.1at%Mo-1.6at%W alloy tape possesses advantages over the available Ni-based alloy tapes and would substitute Ni-5at%W alloy tape for the coating of 2G high temperature superconductor.
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2017, Vol. 31 
