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Effect of ECAP on Change in Microstructure and Critical Current Density of Low Temperature Super-Conducting Monowire

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Abstract

The critical current density (Jc), which is a major performance parameter of low temperature superconducting Nb-46.5 wt%Ti wire, can be improved by uniformly dispersed fine α-Ti precipitates since they serve as a flux pinning center. The high volume fraction of α-Ti precipitates at grain boundary intersections can be achieved by repetitive large deformation and intermediate heat treatments. For this aim, we investigated effect of severe plastic deformation of Nb-46.5 wt%Ti billet on the changes in microstructure and Jc by assigning equal channel angular process (ECAP) followed by groove rolling and drawing. In addition, intermediate heat treatments with different heating condition and holding time after each process were assigned to precipitate the fine α-Ti. It was observed that the curled flow lines like shear bands with the highly dense dislocations were formed after ECAP leading to recrystallization and the high volume fraction of α-Ti after subsequent heat treatment. The additional plastic deformation by groove rolling and drawing increased the volume fraction of the α-Ti and the aspect ratio of its shape. As a result, the critical current density at the lower range of magnetic field was enhanced with increasing the number of ECAP pass.

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Abbreviations

A:

Long diameter of groove rolls (mm)

Γ:

Approach angle (o)

Ao :

Initial area of the billet (mm2)

Ad :

Deformed area of the billet (mm2)

B:

Short diameter of groove rolls (mm)

Bc :

Route with rotation angle 90o in each pass of ECAP

deff :

Effective area of superconducting NbTi material (mm)

D1 :

Inlet diameter in drawing die (mm)

D2 :

Outlet diameter in drawing die (mm)

Ε:

Accumulated strain in groove rolling and drawing

εN :

Accumulated strain in ECAP

Jc :

Critical current density (A/cm2)

L:

Approach length in drawing die (mm)

∆M:

Magnetization loop (emu/cm3)

N:

Number of pass in ECAP

R:

Reduction ratio (%)

Φ:

Inner angle of ECAP die (o)

Ψ:

Corner angle of ECAP die (o)

∆:

Shape factor

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Acknowledgements

This work was supported by Industrial Technology Innovation Program (No.: 10053590) funded by the Ministry of Trade, Industry and Energy (MOTIE), Korea.

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Authors and Affiliations

  1. Technology of Material Science(TOMS), 80 Bangji-ro, Sanam-myeon, Sacheon, Gyeongnam, 52535, Republic of Korea

    Seon-Myung Park

  2. Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam, 51508, Republic of Korea

    Young-Seok Oh, Se-Jong Kim, Hee Rak Kim, Howon Lee, In Yong Moon & Seong-Hoon Kang

  3. Kiswire Advanced Technology Co., Ltd, 223 Techno 2-ro Yuseong-gu, Daejeon, 34026, Republic of Korea

    Duck-Young Hwang

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Park, SM., Oh, YS., Kim, SJ. et al. Effect of ECAP on Change in Microstructure and Critical Current Density of Low Temperature Super-Conducting Monowire. Int. J. Precis. Eng. Manuf. 20, 1563–1572 (2019). https://doi.org/10.1007/s12541-019-00164-3

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  • DOI: https://doi.org/10.1007/s12541-019-00164-3

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