Study on the Heat Treatment Microstructure Evolution of High Field NbTi Superconducting Strand

IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Applied Superconductivity Pub Date : 2024-12-23 DOI:10.1109/TASC.2024.3517571
Yanmin Zhu;Qiang Guo;Pingxiang Zhang;Kailin Zhang;Ruilong Wang;Zijing Zhou;Luyang Han;Shuai Wang;Bo Wu;Jianfeng Li;Xianghong Liu;Yong Feng
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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 .
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高场NbTi超导股热处理组织演变研究
为了扩大NbTi超导股的应用范围,本研究对临界电流密度709 A/mm2较高的样品在(4.2 K, 9 T)下热处理和拉伸后的微观组织演变进行了研究。实验结果表明,热处理和拉伸的共同作用影响了最终性能。从第一次热处理开始,在基体上有少量不规则颗粒析出。随着热处理次数的增加,析出相增多,经热处理后析出相显著增多,最多可达19.7%。每次热处理后,原析出相增大,同时又产生新的析出相。随着最后的拉伸,沉淀变成条状。与普通NbTi超导线的Jc (4.2 K, 9 T)约为580 A/mm2相比,在适当的终应变下,Jc (4.2 K, 9 T)大于700 A/mm2。
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来源期刊
IEEE Transactions on Applied Superconductivity
IEEE Transactions on Applied Superconductivity 工程技术-工程:电子与电气
CiteScore
3.50
自引率
33.30%
发文量
650
审稿时长
2.3 months
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.
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