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首页> 外文期刊>Superconductor Science & Technology >Improvement of mechanical and superconducting properties in CuNb/(Nb,Ti)_3Sn wires by applying bending strain at room temperature
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Improvement of mechanical and superconducting properties in CuNb/(Nb,Ti)_3Sn wires by applying bending strain at room temperature

机译：通过在室温下施加弯曲应变来改善CuNb /（Nb，Ti）_3Sn线材的机械和超导性能

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摘要

The improvement of stress/strain properties has been observed for the CuNb/(Nb,Ti)_3Sn coil made by a react and wind (R&W) method. In the winding and insulation processes, a certain bending strain is applied to the wire and then released at room temperature, which is defined as 'pre-bending' treatment. In order to understand this behaviour, we examine the influences of bending strain at room temperature on the mechanical and superconducting properties in (Nb,Ti)_3Sn composite wire. Experimental results for the pre-bent CuNb/(Nb,Ti)_3Sn wires show the improvement of the stress dependence of I_c/I_(cm) and the increase of the critical current I_c at zero stress. The calculation on the basis of the distribution of the uniaxial local stress/strain describes the experimental results, qualitatively. We have found that the improvement of the critical current and the mechanical properties is due to the local work hardening effects by applying the bending strain at room temperature.
机译：已经观察到通过反应和风（R＆W）方法制成的CuNb /（Nb，Ti）_3Sn线圈的应力/应变性能有所提高。在缠绕和绝缘过程中，将一定的弯曲应变施加到电线上，然后在室温下释放，这被定义为“预弯曲”处理。为了理解这种行为，我们研究了室温下的弯曲应变对（Nb，Ti）_3Sn复合线材的力学性能和超导性能的影响。预弯曲的CuNb /（Nb，Ti）_3Sn导线的实验结果表明，在零应力下，应力依赖性I_c / I_（cm）有所改善，临界电流I_c有所增加。基于单轴局部应力/应变分布的计算定性地描述了实验结果。我们已经发现，临界电流和机械性能的提高是由于通过在室温下施加弯曲应变而产生的局部加工硬化效应。

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