{"title":"Study on the Heat Treatment Microstructure Evolution of High Field NbTi Superconducting Strand","authors":"Yanmin Zhu;Qiang Guo;Pingxiang Zhang;Kailin Zhang;Ruilong Wang;Zijing Zhou;Luyang Han;Shuai Wang;Bo Wu;Jianfeng Li;Xianghong Liu;Yong Feng","doi":"10.1109/TASC.2024.3517571","DOIUrl":null,"url":null,"abstract":"To expand the application of NbTi superconducting strand, this study investigates the microstructure evolution after heat treatment and drawing of samples with higher Critical Current Density 709 A/mm\n<sup>2</sup>\n at (4.2 K, 9 T). The experimental results indicate that the combined action of heat treatment and drawing influences the final performance. Beginning the 1st heat treatment, there are a few irregular particle precipitates on the matrix. The precipitates increase with the heat treatment times, and it significantly increases up to 19.7% after heat treatment. After every heat treatment, the original precipitates grow larger, and simultaneously, new precipitates are generated. With the final drawing, the precipitates become strips. The \n<italic>J</i>\nc (4.2 K, 9 T) is more than 700 A/mm\n<sup>2</sup>\n with the proper final strain, compared with the normal NbTi superconducting wire with the \n<italic>J</i>\nc (4.2 K, 9 T) of approximately 580 A/mm\n<sup>2</sup>\n.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7000,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Applied Superconductivity","FirstCategoryId":"101","ListUrlMain":"https://ieeexplore.ieee.org/document/10812954/","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
To expand the application of NbTi superconducting strand, this study investigates the microstructure evolution after heat treatment and drawing of samples with higher Critical Current Density 709 A/mm
2
at (4.2 K, 9 T). The experimental results indicate that the combined action of heat treatment and drawing influences the final performance. Beginning the 1st heat treatment, there are a few irregular particle precipitates on the matrix. The precipitates increase with the heat treatment times, and it significantly increases up to 19.7% after heat treatment. After every heat treatment, the original precipitates grow larger, and simultaneously, new precipitates are generated. With the final drawing, the precipitates become strips. The
J
c (4.2 K, 9 T) is more than 700 A/mm
2
with the proper final strain, compared with the normal NbTi superconducting wire with the
J
c (4.2 K, 9 T) of approximately 580 A/mm
2
.
期刊介绍:
IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.