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首页> 外文期刊>Journal of Applied Physics >Room and low temperature direct three-dimensional-strain measurements by neutron diffraction on as-reacted and prebent CuNb/Nb_3Sn wire
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Room and low temperature direct three-dimensional-strain measurements by neutron diffraction on as-reacted and prebent CuNb/Nb_3Sn wire

机译：室温和低温下直接在已反应和弯曲的CuNb / Nb_3Sn线上通过中子衍射测量三维应变

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摘要

We measured directly by neutron diffraction the axial and lateral residual strains for the prebent and the as-reacted CuNb/Nb_3Sn wires at room temperature and at 7 K, in order to investigate the change of the residual strain with prebending treatment. In the axial direction of the wire, the residual strain was changed with 0.20% to the tensile side when measured at both temperatures, while in the lateral direction, the change was 0.08% and 0.03% to the compressive side for the measurements at RT and 7 K, respectively. From the obtained data, we estimated the deviatoric strain. At 7 K, the value is 0.40% for the as-reacted wires and it reduces to 0.19% when the prebending is applied with a strain ε_(pb) = 0.8%. These results suggest that the reduction of the residual strain in the axial direction as well as in the lateral direction, i.e., of the deviatoric strain is responsible for the observed enhancement in the superconducting properties of the prebent Nb_3Sn wires. In addition, we succeeded in the quantitative evaluation of the deviatoric strain dependence of the upper critical field for the practical Nb_3Sn wire. This is very important for the understanding of the general axial strain dependence of the superconducting properties.
机译：我们通过中子衍射法直接测量了室温和7 K下弯曲的和刚反应的CuNb / Nb_3Sn焊丝的轴向和横向残余应变，以研究残余弯曲随预弯曲处理的变化。在两种温度下测量时，金属丝的轴向残余应力向拉伸侧变化为0.20％，而在室温和室温下，在横向方向，残余应变向压缩侧变化为0.08％和0.03％。 7K。根据获得的数据，我们估计了偏应变。在7 K下，刚反应的金属丝的值为0.40％，当以应变ε_（pb）= 0.8％施加预弯曲时，该值减小为0.19％。这些结果表明，轴向和横向的残余应变的减小，即偏向应变的减小是导致观察到的Nb_3Sn导线的超导性能增强的原因。此外，我们成功地对实用Nb_3Sn线的上临界场的偏应变应变依赖性进行了定量评估。这对于理解超导特性的一般轴向应变依赖性非常重要。

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