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郭强,张平祥,冯勇,刘向宏,李建峰,闫凯鹃.新型时效热处理工艺对多芯NbTi超导线材微观组织和临界电流密度的影响[J].稀有金属材料与工程(英文),2019,48(12):4113~4118.[GUO Qiang,ZHANG Ping-Xiang,FENG Yong,LIU Xiang-Hong,LI Jian-Feng and Yanm Kai-Juan.The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire[J].Rare Metal Materials and Engineering,2019,48(12):4113~4118.]
The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire
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Received:March 27, 2019  Revised:April 23, 2019
DOI:
Key words: NbTi superconducting wire  critical current density  aging heat treatment  pre-strain  final strain
Foundation item:陕西省国际科技合作计划项目(编号:2017KW-022)资助课题
Author NameAffiliation
GUO Qiang,ZHANG Ping-Xiang,FENG Yong,LIU Xiang-Hong,LI Jian-Feng and Yanm Kai-Juan  
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Abstract:
      In present paper, NbTi/Cu wire the low copper-to-superconductor ratio of 1.3 and filament number of 630 was prepared using high homogenous Nb47Ti alloy bar and oxygen-free copper firstly. New type of aging heat treatment (“405℃/3h + 405℃/3h + 420℃/20h + 420℃/40h + 420℃/80h”) was proposed. Comparing with the traditional heat treatment, this new type heat treatment can largely improve the critical current density of NbTi superconducting wire to 3208A/mm2, with an increment of 17.5%. Only when the pre-heat treatment times is equal to or more than 2 times, huge of nucleation can be formed and critical current density can be improved obviously. In addition, Critical current densities of wire under three pre-strain conditions (4.64, 5.35 and 6.25) all get the peak value when final strain is between 5.0~5.2.