The influence of electroplastic rolling on the mechanical deformation and phase evolution of Bi-2223/Ag tapes |
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Authors: | Yongjin Lu Timing Qu Pan Zeng Liping Lei Gang Fang Jianfeng Sun |
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Affiliation: | (1) Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China;(2) Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China;(3) Innova Superconductor Technology Co. Ltd. (INNOST), Beijing, 100176, China |
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Abstract: | Electroplastic rolling (EPR) of Bi-2223/Ag superconducting wires was performed, where pulse currents were applied during rolling
to introduce an electroplastic effect. It was found that the rolling force decreased significantly compared with the traditional
rolling process. Furthermore, EPR favorably minimized the sausage effect. It is revealed that the electroplastic effect can
facilitate the mechanical deformation of Bi-2223/Ag composites. Segments of the Bi-2223/Ag tapes were heat treated at 830 °C
for different time periods. The phase assemblies of these samples suggest that current pulses contribute to faster transformation
kinetics from the Bi-2212 phase to the Bi-2223 phase. In addition, a preliminary improvement of 28% of critical current density
has been achieved in a fully processed tape with EPR. |
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Keywords: | |
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