本研究以Cu10Ni合金作为基体材料,采用组装法制备了铜比1.8,Φ0.7 mm的快脉冲超导磁体用NbTi超导线材.研究了Cu10Ni合金、时效次数和最终应变、去应力退火对快脉冲超导磁体用NbTi/Cu超导线微观组织和临界电流密度的影响.实验结果表明:采用Cu10Ni合金作为基体,时效3次且最终应变在3.5-5.0之间时,线材最终应变增大,临界电流密度呈先增大而后降低,最终趋于稳定的变化规律;最终应变为4.37时,随着热处理次数的增加,临界电流密度呈先增大而后降低的趋势,断线次数也随之明显增多.损耗的测试结果表明:采用Cu10Ni合金为基体制备的超导线材的损耗要明显小于无氧铜基体的超导线材.经过3次时效热处理且最终应变为4.37时,Cu10Ni合金为基体制备的超导线材其临界电流密度最高为2308 A/mm2(4.2K,5T,判据0.1 μV/cm),损耗为40.8 mJ/cm3,(±3 T,4.2 K).
In this paper,Cu10Ni alloy was used as matrix material to prepare NbTi/Cu wire with the copper-tosuperconductor ratio of 1.8 and the diameter of Φ0.7mm for fast pulsed superconducting magnet.The effect of Cu10Ni alloy,heat treatments times and final strain,annealing on the microstructure and critical current density of NbTi superconducting wire was investigated.The results show that:When the heat treatments was 3 times,critical current density raised firstly,and then descended to a stable value as the final drawing strain varies from 3.5 to 5.0.In addition,when the final strain is 4.37,with the increase of the number of heat treatment times,the critical current density increases firstly and then decreased,also the broken times was significantly increased.The test results show that the loss of the superconducting wire with Cu10Ni matrix was significantly less than the superconducting wire with oxygen-free copper matrix.After three times heat treatment with the final strain aging of 4.37,the critical current density of the superconducting wire with Cu10Ni matrix was up to 2308 A / mm2 (4.2 K,5 T,criterion 0.1 μV / cm),AC loss was 40.8 mJ / cm3,(±-3 T,4.2 K).
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