内锡法Nb_3 Sn超导线材的A15相成相动力学研究(英文)  

A15 PHASE GROWTH KINETICS OF INTERNAL-Sn Nb_3 Sn SUPERCONDUCTING WIRES

作　　者：张超武[1] 周廉[1,2] 唐先德[2] Andre Sulpice Jean-Louis Soubeyroux 张平祥[2] 卢亚峰[2] 

机构地区：[1]陕西科技大学材料学院,陕西西安710021 [2]西北有色金属研究院,陕西西安710016 [3]法国国家科研中心CNRS/CRETA,BP166,38042 Grenoble,法国

出　　处：《低温物理学报》2009年第1期1-6,共6页Low Temperature Physical Letters

基　　金：中法科技合作项目(项目编号:CNRS No722441);陕西科技大学博士基金(项目编号:BJ07-07)资助的课题~~

摘　　要：为研究Nb3Sn超导材料的A15相成相动力学,设计并制备了四组单组元内锡法(MEIT)超导线。这四组MEIT导线设计了不同的Sn/Cu比,并在一组导线中合金化掺杂了1at%Zr。所有导线样品先经历210°C/50hr+340°C/25hr的Cu-Sn合金化热处理,然后进行A15相成相热处理。选择四种反应温度:650℃,675℃,700℃和725℃,以研究成相热处理温度和时间的影响。用SEM技术测定所有热处理样品的A15相层厚,然后对不同温度下的热处理时间作图,并进行非线性拟合。所得结果表明四种因素促进了A15相的增长:增加反应温度,延长反应时间,增大Sn/Cu比率和合金化掺杂Zr;内锡法Nb3Sn超导线材的成相动力学服从Yn=K(T)t变化关系,A15相生长指数n值受热处理温度和Zr掺杂的影响.For investigating A15 phase formation kinetics of Nb3Sn superconductors four sets of mono-element internal-Sn （MEIT） wires were designed and fabricated, which have different Sn/Cu ratio and lat% Zr addition in one wire. All samples underwent a 210℃/50hr ＋ 340℃/25hr thermal treatment for Cu-Sn alloying prior to the A15 phase formation heat treatment. Four reaction temperatures of 650℃, 675℃,700℃ and 725℃ were chosen to study the temperature influence with different time durations. Through SEM the heat-treated samples were examined for A15 layer thicknesses which were then plotted versus heat treatment time at different temperatures and non-linearly fitted. The obtained results demonstrate that the A15 phase growth is promoted by four factors： reaction temperature elevation, reaction time exten-sion, Sn/Cu ratio enlargement and the alloyed Zr addition. The phase formation kinetics of internal-Sn Nb3Sn superconducting wires is in agreement with Yn = K（T） t relation and the A15 growth exponent n isaffected by HT temperature and Zr alloying.

关 键 词：Nb3sn超导线 单组元内锡法(MEIT) Sn/Cu比 zr合金化掺杂 A15相成相动力学 

分 类 号：TM26[一般工业技术—材料科学与工程]