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采用高均匀性、低杂质含量的优质 Nb46 .5 Ti (质量分数 ,下同 )合金锭 ,研究了热处理制度对 Nb46 .5 Ti/ Cu多芯超导体临界电流密度的影响。结果表明 :较低温度预时效热处理有利于 Nb Ti超导体中α - Ti沉淀相细化 ,而且分布弥散 ;时效次数越多 ,这种效果就越明显 ,同时时效次数越多 ,α - Ti沉淀相数目及密度也越高 ,从而有利于Nb46 .5 Ti超导体 Jc的提高。另外这种工艺还使多芯 Nb46 .5 Ti/ Cu复合线获得最佳 Jc的最终附加应变减小 ,对多芯复合线的生产具有重要意义。其最高 Jc为 35 0 0 A/ mm2 (4.2K,5 T,判据 0 .1μV/ cm)和 1740 A/ mm2 (4.2 K,8T,判据 0 .1μV/ cm)
The effect of heat treatment on the critical current density of Nb46.5 Ti / Cu multi-core superconductors was investigated by using high quality Nb46.5 Ti (mass fraction) ingot with high homogeneity and low impurity content. The results show that the pre - treatment heat treatment at lower temperature is beneficial to the refinement of α - Ti precipitates in Nb Ti superconductors, and their distribution is dispersed. The more the aging time is, the more obvious this effect is. At the same time, the more α - Ti precipitates The higher the number and density, which is conducive to the Nb46 .5 Ti superconductor Jc increase. In addition this kind of craft also makes the multi-core Nb46 .5 Ti / Cu composite wire obtains the best Jc the final additional strain reduction, to the multi-core compound line production is of great significance. The maximum Jc was 35 0 0 A / mm2 (4.2 K, 5 T, criterion 0 .1 μV / cm) and 1740 A / mm2 (4.2 K, 8 T, criterion 0.1 μV / cm)