Local plastic deformation effects on the critical current of high-Jc Nb3Sn strands under uniaxial strain

材料科学 变形(气象学) 电流(流体) 凝聚态物理 拉伤 临界电流 复合材料 热力学 超导电性 物理 医学 内科学
作者
Yunhao Liu,Yi Sun,Peng Gao,Arend Nijhuis,A. Devred,Zichuan Guo,huajin zhu,Peng Xu,Yixiang Shi,Fang Liu,Chao Dai,Yu Wu,Jinggang Qin
出处
期刊:Superconductor Science and Technology [IOP Publishing]
卷期号:37 (11): 115009-115009
标识
DOI:10.1088/1361-6668/ad7647
摘要

Abstract In order to meet the target operating parameters of the toroidal field coils (TFCs) for the next-generation Chinese compact burning plasma tokamak, high critical current density ( J c ) Nb 3 Sn strand will be applied to the high-field winding-package of the TFC. To improve the transverse stiffness of the cable in withstanding the huge Lorentz force and avoiding conductor performance degradation, the short-twist-pitch and copper-wound-strand cable patterns were taken into consideration. In the processes of cabling and compaction of the conductor, the tight cable configurations lead to severe local plastic deformation (LPD) within the strands. The strands in the conductor are subjected to strain caused by thermal contraction and Lorentz force during conductor cooling down and operation. So far it is unknown, whether the LPD could impact the critical current ( I c ) versus uniaxial applied strain behavior of high- J c Nb 3 Sn strand. Aiming to investigate the effect of LPD on the I c of strands under uniaxial strain, three types of high J c Nb 3 Sn strand with different indentation depths were tested on a U-shaped bending spring. The axial strain ranges from −0.9% to +0.4% at 14 T and 4.2 K. The three types of strands showed more strain sensitivity and lower tensile irreversible strain limit with increasing LPD, while even irreversible degradation of the I c could be observed in the compressive strain region. The sample preparation, test process, test results and analysis are reported.
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