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,2019,48(12):4113~4118.[GUO Qiang,ZHANG Ping-Xiang,FENG Yong,LIU Xiang-Hong,LI Jian-Feng,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.]
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
投稿时间:2019-03-27  修订日期:2019-04-23
中文关键词:  NbTi超导线材,临界电流密度,时效,最终应变
基金项目:陕西省国际科技合作计划项目(编号:2017KW-022)资助课题
中文摘要:
      本文以高均匀性Nb47Ti合金棒和高纯无氧铜为原材料,制备了铜比1.3,630芯的NbTi/Cu超导线。提出了一种新型时效热处理工艺“短时预时效热处理+高温长时间时效热处理”,即“405℃/3h + 405℃/3h + 420℃/20h + 420℃/40h + 420℃/80h”工艺,该工艺可显著提高NbTi超导线材的临界电流密度,较普通热处理艺线材提高近17.5%,最高可以达到3208A/mm2。足够的预时效次数(2次)才能使基体中析出足够多的α形核数量,进而才能在较大的最终应变下显著提高临界电流密度。此外,在4.64,5.35,6.25三种预应变条件之下,临界电流密度达到峰值的最终应变都集中在5.0~5.2之间,即,必须将最终应变控制在5.0~5.2。该新型工艺已经应用于大批量生产中,线材各种性能稳定,得到客户的一致认可。
The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire
英文关键词:NbTi superconducting wire  critical current density  aging heat treatment  pre-strain  final strain
英文摘要:
      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.
作者单位E-mail
郭强 西部超导材料科技股份有限公司 guoqiang@c-wst.com 
张平祥 西部超导材料科技股份有限公司  
冯勇 西部超导材料科技股份有限公司  
刘向宏 西部超导材料科技股份有限公司  
李建峰 西部超导材料科技股份有限公司  
闫凯鹃 西部超导材料科技股份有限公司  
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