Superconductivity under uniaxial tensile strain on internal reinforced Nb3Sn multifilamentary wire using Cu-Sn-Zn ternary alloy matrix

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Hishinuma, Yoshimitsu^1 ; Oguro, Hidetoshi^2 ; Taniguchi, Hiroyasu^3 ; Awaji, Satoshi^4 ; Kikuchi, Akihiro^5

National Institute for Fusion Science, Oroshi-cho, Toki Gifu

322-6, Japan^1

Tokai University, 4-1-1 Kitakaname, Kanagawa, Hiratsuka, Japan^2

Osaka Alloying Woks Co.Ltd, 45-5-9, Shirakata, Fukui, Japan^3

Institute for Material Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Miyagi Sendai, Japan^4

National Institute for Materials Science, 1-2-1 Sengen, Ibaraki, Tsukuba, Japan^5

关键词: Electromagnetic forces;    Reinforcement materials;    Solid solution strengthening;    Strength improvements;    Superconducting properties;    Uniaxial tensile deformation;    Uniaxial tensile strain;    Upper critical magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012175/pdf
DOI  :  10.1088/1757-899X/502/1/012175

来源: IOP

【 摘 要 】

The degradations of superconducting properties by mechanical strain on actual Nb3Sn wire are a serious problem for the future fusion magnets operated under high electromagnetic force. Recently, we succeeded to fabricate Cu-Sn-Zn ternary alloy matrix, which is high strength alloy by the Zn solid solution strengthening, based on the internal reinforced bronze process in order to investigate the mechanical strength improvement. In this study, the upper critical magnetic field (Hc2) under uniaxial tensile deformation on several bronze-processed Nb3Sn multifilamentary wires were evaluated. We confirmed that the peak tensile strain values, which obtained maximum Hc2 under uniaxial tensile deformation, were shifted to higher tensile strain region with increasing amount of Zn composition in the Cu-Sn-Zn ternary alloy matrix. The internal reinforced bronze matrix via solid solution strengthening would become attractive and simple method without reinforcement material.