Abstract

To construct magnetic systems in modern high-energy physics projects, such as creation of the Future Circular Collider (FCC) and modernization of the Large Hadron Collider (HL-LHC), Nb₃Sn superconductors with a high level of electrophysical properties, above all being a high current carrying capacity, are requisite. Such multifilament Nb₃Sn superconductors are obtained by the technique of internal feeding of tin (IFT), consisting in deformation of a composite including high-purity niobium, copper, and tin to make a wire smaller less than 1 mm in diameter. The presence of such components as tin-based alloys or pure tin with T_m = 232°C in the composite wire composition precludes the possibility of Nb recrystallization annealing, which imposes strict requirements on the Nb mechanical properties, which determine the Nb capability for plastic deformation. In the study, the influence of the design and conditions of creating bimetal Nb/Cu rods on the grain structure of niobium and the state of the boundary between it and a copper sheath is discussed. The mechanical properties of rods at different steps of their fabrication are investigated. The results will be applied in development of the technological conditions of manufacture of Nb₃Sn superconductors by the IFT technique.

中文翻译：

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用于生产Nb 3 Sn超导体的双金属Nb / Cu棒的结构和力学性能

摘要

在现代高能物理项目中构建磁系统，例如创建未来圆形对撞机（FCC）和现代化大型强子对撞机（HL-LHC），首先是具有高电物理性质的Nb ₃ Sn超导体必须具有很高的载流量。这样的复丝Nb ₃ Sn超导体是通过锡的内部供给（IFT）技术获得的，该技术包括使包含高纯度铌，铜和锡的复合物变形以使线径小于1mm。锡基合金或T _m的纯锡等成分的存在复合线材中的232°C排除了Nb重结晶退火的可能性，这对Nb力学性能提出了严格要求，而Nb力学性能决定了Nb塑性变形的能力。在研究中，讨论了制备双金属Nb / Cu棒的设计和条件对铌的晶粒结构及其与铜鞘之间的边界状态的影响。研究了棒在其制造的不同步骤的机械性能。该结果将用于通过IFT技术开发Nb ₃ Sn超导体的技术条件的开发。