全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
科学通报  2014 

高场磁体用套管法Nb3Al超导线材制备及性能

DOI: 10.1360/N972014-00348, PP. 2191-2196

Keywords: 低温超导线材,Nb3Al,临界温度,套管法,急热急冷热处理

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用套管法,结合挤压、拉拔和轧制等塑性加工过程制备了Nb3Al超导线材前驱体长线,并利用自主设计制作的急热急冷(~2000℃,RHQ)装置对线材样品进行RHQ热处理和低温成相退火,获得了高性能的Nb3Al超导线材.结果表明,该线材由管状Nb3Al超导体、Nb基体骨架和孔洞组成;即通过RHQ热处理使Al芯与周围的Nb实现固溶体化,并留下孔洞,随后的低温成相退火使Nb-Al固溶体生成了管状Nb3Al超导体,而在距离Al源较远的位置则留下未反应的Nb基体骨架.通过扫描电子显微镜和磁化率测量显示,该线材中Nb3Al超导体具有精细的晶粒尺寸(50~100nm)和良好的晶粒连接性;不同样品的起始超导转变温度(Tc)均达到了约17K,表明该线材中Nb3Al超导体的Nb/Al原子比接近理想的31.因此,利用套管法有望制备出满足下一代高场磁体应用的高性能Nb3Al超导线材.

References

[1]  1 Koizumi N, Takahashi Y, Nunoya Y, et al. Critical current test results of 13 T-46 kA Nb3Al cable-in-conduit conductor. Cryogenics, 2002, 42: 675-690
[2]  2 Mitsuda C, Tsuchiya K, Terashima A, et al. Development of Nb3Al wires with high critical current density for future accelerator magnets. IEEE Trans Appl Supercond, 2007, 17: 2693-2696
[3]  3 Glowacki B. Niobium aluminide as a source of high-current superconductors. Intermetallics, 1999, 7: 117-140
[4]  4 Webb G W. Cold working Nb3Al in the bcc structure and then converting to the A15 structure. Appl Phys Lett, 1978, 32: 773-775
[5]  5 Woolam J A, Alterovitz S A, Haugland E, et al. Critical currents in A15 structure Nb3Al converted from cold-worked bcc structure. Appl Phys Lett, 1980, 36: 706
[6]  6 Takeuchi T. Nb3Al conductors for high-field applications. Supercond Sci Technol, 2000, 13: R101-R119
[7]  7 Jin X, Oguro H, Nakamoto T, et al. Tensile strain dependence of critical current of RHQ-Nb3Al wires. Cryogenics, 2012, 52: 805-809
[8]  8 Takeuchi T, Nakagawa K, Tsuchiya K, et al. Applicability of reel-to-reel RHQ treatments to Nb3Al precursors with a Ta/Cu/Ta three-layer filament-barrier structure. IEEE Trans Appl Supercond, 2013, 23: 6000805

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133