Investigation of the microstructure and superconducting property of the NbTi superconducting joint fabricated by the electron beam welding method
In this work, we first showed the NbTi superconducting joint fabricated by the electron beam welding (EBW) method. The EBSD results showed that the EBW method can successfully weld the multi-filamentary NbTi wire to the whole piece. The micro-CT was also used to non-destructively observe the microst...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ade6ce |
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| Summary: | In this work, we first showed the NbTi superconducting joint fabricated by the electron beam welding (EBW) method. The EBSD results showed that the EBW method can successfully weld the multi-filamentary NbTi wire to the whole piece. The micro-CT was also used to non-destructively observe the microstructure of the NbTi joint, which shows a porosity of only 1.34%. The joint resistance of the NbTi joint fabricated by the EBW method can reach as low as 3 × 10 ^−14 Ω after 75 h of magnetic field decay measurement. This value is lower than the lowest resistance value from the cold-press method ever reported and not higher than the superconducting joint, which indicates that the EBW method is a promising method for fabricating the NbTi joint beyond the traditional cold-press and superconducting solder method. However, the EBW method may also eliminate the α-Ti phase during the melt process, which will decrease the pinning effect in the NbTi joint and finally cause the critical current density to drop faster under the applied field. |
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| ISSN: | 2053-1591 |