Properties of seven-filament Cu/Ag-sheathed(Ba,K)Fe_(2)As_(2)tapes fabricated from round and square wires  

作　　者：Zhen-Kun Jin Cong Liu Chao Yao Liu Li He Huang Dong-Liang Wang Chi-Heng Dong Kai Wang Xian-Ping Zhang Satoshi Awaji Yan-Wei Ma 

机构地区：[1]Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]High Field Laboratory for Superconducting Materials,Institute for Materials Research,Tohoku University,Sendai 980-8577,Japan

出　　处：《Rare Metals》2021年第12期3651-3659,共9页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.U1832213,51721005 and 51861135311);the National Key R&D Program of China(Nos.2018YFA0704200 and 2017YFE0129500);the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(No.QYZDJ-SSW-JSC026);the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB25000000)。

摘　　要：Iron-based superconductor,a promising candidate for high-field applications,has attracted significant attentions.For practical utilization,the superconducting tapes should have high transport critical current density(J_(c)),low production cost,larger mechanical strength and good homogeneity.In this study,seven-filament Cu/Agsheathed(Ba,K)Fe_(2)As_(2)tapes were fabricated from round and square wires.It is found that the tapes rolled from square wires have a desirable uniformity of filament deformation and distribution,compared with the ones rolled from round wires.Moreover,the J_c of tape was obviously improved by using square drawing dies instead of traditional round ones.For the tapes rolled from square wires annealed under ambient and 2 MPa by hot pressing,the transport J_c values reached 1.51×10^(4) A·cm^(-2)and 4.86×10^(4) A.cm^(-2)(4.2K,10T),respectively.The deformation process on the cross section of the tapes during rolling was analyzed by using the powder-flow model.These results indicate a potential application of Cu/Ag(Ba,K)Fe_(2)As_(2)tapes in high-magnetic-field region.

关 键 词：Iron-based superconductor Multi-filament tape Cu/Ag sheath Square drawing dies Critical current density Powder-flow model 

分 类 号：TG335.56[金属学及工艺—金属压力加工]