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首页> 外文期刊>Superconductor Science & Technology >Evidence for highly localized damage in internal tin and powder-in-tube Nb3Sn strands rolled before reaction obtained from coupled magneto-optical imaging and confocal laser scanning microscopy
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Evidence for highly localized damage in internal tin and powder-in-tube Nb3Sn strands rolled before reaction obtained from coupled magneto-optical imaging and confocal laser scanning microscopy

机译：耦合磁光成像和共聚焦激光扫描显微镜观察到的反应之前，内部锡和管内粉末Nb3Sn线束中存在高度局部损坏的证据

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摘要

Nb_3Sn strands for high-current, high-field magnets must be cabled before reaction while the conductor is still composed of ductile components. Even though still in the ductile, deformable state, significant damage can occur in this step, which expresses itself by inhomogeneous A15 formation, Sn leakage or even worse effects during later reaction. In this study, we simulate cabling damage by rolling recent high performance powder-in-tube (PIT) and internal tin (IT) strands in controlled increments, applying standard Nb_3Sn reaction heat treatments, and then examining the local changes using magneto-optical imaging (MOI), scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). These combined characterizations allow any local damage to the filament architecture to be made clear. MOI directly reveals the local variation of superconductivity while CLSM is extremely sensitive in revealing Sn leakage beyond the diffusion barrier into the stabilizing Cu. These techniques reveal a markedly different response to deformation by the PIT and IT strands. The study demonstrates that these tools can provide a local, thorough, and detailed view of how strands degrade and thus complement more complex extracted strand studies.
机译：用于大电流，高磁场磁体的Nb_3Sn股线必须在反应之前进行电缆连接，而导体仍由韧性成分组成。即使仍处于延展性，可变形状态，在此步骤中也可能发生重大损坏，其表现为不均匀的A15形成，Sn泄漏或在以后的反应中甚至更坏的影响。在这项研究中，我们通过以可控的增量滚动最近的高性能粉管（PIT）和内部锡（IT）线，应用标准Nb_3Sn反应热处理，然后使用磁光成像检查局部变化，来模拟电缆损坏（MOI），扫描电子显微镜（SEM）和共焦激光扫描显微镜（CLSM）。这些综合的特征可以使对灯丝结构的任何局部损坏都清晰可见。 MOI直接揭示了超导性的局部变化，而CLSM对揭示锡从扩散势垒扩散到稳定的Cu方面非常敏感。这些技术揭示了PIT和IT股对变形的响应明显不同。该研究表明，这些工具可以提供有关链如何降解的本地，彻底和详细的视图，从而补充更复杂的提取链研究。

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