Enhancement of Critical Current Densities by the Prebending Strain at Room Temperature for Nb3Sn Wires
Enhancement of Critical Current Densities by the Prebending Strain at Room Temperature for Nb3Sn Wires
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室温预弯应变提高 Nb3Sn 丝的临界电流密度
DOI：
10.1143/jjap.42.l1142
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发表时间：
2003
影响因子：
1.5
通讯作者：
S. Meguro
中科院分区：
文献类型：
--
作者：
S. Awaji;Kazuo Watanabe;G. Nishijima;K. Katagiri;K. Miyoshi;S. Meguro
研究了室温反复弯曲应变对青铜线材Nb3Sn线临界电流密度的影响。我们发现，在室温下施加反复弯曲载荷(预弯曲处理)后，临界电流Ic显著增加。当预弯应变为0.5%时，CuNb增强Nb3Sn线的IC在16T时增加约一倍，临界电流密度Jc在4.2K和16T时达到约528A/mm2。对比CuNb/Nb3Sn线预弯处理前后的应力依赖IC值，不仅改善了IC的应力相关性，而且改善了轴向无应变状态下的最大IC。应力依赖IC的改进与基于单轴应力/应变分布模型的计算结果相一致。此外，最大IC的增加可能与预弯处理沿径向释放应力/应变状态有关。
The influence of a repeated bending strain at room temperature on the critical current densitiy of bronze route Nb3Sn wires was investigated. We found that the critical current Ic is significantly increased by applying a repeated bending load (pre-bending treatment) at room temperature. The maximum enhancement of Ic was approximately twice at 16 T for CuNb-reinforced Nb3Sn wires by a 0.5% prebending strain and the critical current density Jc became about 528 A/mm2 at 4.2 K and 16 T. A comparison of the stress dependent Ic values obtained before and after applying prebending treatments for CuNb/Nb3Sn wires indicates that not only the stress dependence of Ic but also the maximum Ic at the axial strain-free state are improved. The improvement of the stress dependent Ic is in agreement with the prediction made based on the calculation using the uniaxial stress/strain distribution model. Moreover, the increase in the maximum Ic may be related to the release of stress/strain states along the radial direction through prebending treatments.