轧制与拉伸对NbTiTa/Cu多芯复合线超导性能的影响

Effect of Rolling and Drawing on Superconducting Property in NbTiTa/Cu Multifilamentary Wires

摘要:

利用Nb47Ti和Ta片作为原料，经过3次挤压并结合拉伸和轧制2种不同工艺，通过时效热处理制备出了NbTiTa/Cu超导线材。通过标准四引线法测量了2种线材在4.2 K下的超导性能。结果表明，采用拉伸法制备的NbTiTa线材具有更高的临界电流密度，φ1.0 mm的超导线材Jc在4.2 K、8 T下，超导性能达到791 A/mm2。通过对线材的微观组织观察表明：在相同条件下，采用拉伸后的试样芯径大小均匀、铜比均匀、芯丝排列整齐且间距相等

Abstract:

NbTiTa/Cu superconducting wires were prepared through the thermal diffusion using NbTi sheets and Ta sheets as raw materials. During the process, the rolling and drawing methods were applied after three times extrusion. The superconducting property was measured by the standard method at 4.2 K in High Magnetic Field Laboratory in France. The results indicate that a higher critical current density is obtained in the drawing wires. Jc can reach 791 A/mm2 at 4.2 K and 8 T in the drawing wires with diameter of 1.0 mm. The investigation of microstructure shows that the homogenous filament, homogenous Cu/Sc ratio and same spacing between filaments are found in the drawing wires at the same conditions