原位粉末装管法37芯MgB2线材的制备及性能研究  

Fabrication and Properties of 37-Filaments MgB2 Superconducting Wires by In-Situ Powder-in-Tube Method

作　　者：王庆阳[1] 张可荣 杨芳[1] 熊晓梅[1] 郗丹[3] 王大友[3] 李成山[1] 闫果[3] 冯勇[3] 张平祥[1,3] Wang Qingyang;Zhang Kerong;Yang Fang;Xiong Xiaomei;Xi Dan;Wang Dayou;Li Chengshan;Yan Guo;Feng Yong;Zhang Pingxiang(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China;Xizang Minzu University,Xianyang 712082,China;Western Superconducting Technologies Co.Ltd,Xi’an 710018,China)

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西藏民族大学,陕西咸阳712082 [3]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》2020年第8期2825-2829,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51772250);陕西省自然科学基金(2017ZDJC-19);西安市未央区科技计划项目(201818)。

摘　　要：以强度较高的蒙乃尔合金(Monel 400)作为包套材料,以旋锻、拉拔、轧制及中间热处理相结合的加工手段制备出直径1.0 mm、37芯结构的多芯MgB2超导长线材。微观结构分析表明多芯线材中MgB2芯丝及替换芯丝等亚组元的分布较为规整,阻隔层未出现明显破损现象,最终线材中MgB2超导芯丝的平均直径约80μm。室温拉伸性能显示热处理前MgB2线材的屈服强度为759 MPa,热处理后的线材为248 MPa。4.2 K、4 T下,线材的临界电流密度Jc达到2.31×10^5 A·cm^-2,工程临界电流密度达到3.16×10^4 A·cm^-2。The 37 filaments MgB2 long wires with the diameter of 1.0 mm,sheathed with higher strength Monel alloys(Monel 400)were fabricated with compound fabrication process including rotary swage,drawing,rolling and middle annealing heat treatment.The microstructure results show that the subcomponent including MgB2 filament and NbCu replacement is uniformly distributed,and there is no breaking point in the Nb diffusion barrier.The mean diameter of MgB2 filament is only 80μm in final wires.The yield strength is around 759 MPa for the as-drawn wire and 248 MPa for the sintered wire.The critical current density(Jc)and engineering current density(Je)reach 2.31×10^5 and 3.16×10^4 A·cm^-2 at 4.2 K and 4 T,respectively.

关 键 词：二硼化镁 多芯线材 力学性能 超导性能 

分 类 号：TM26[一般工业技术—材料科学与工程]