Effect of heat treatment on critical current density in multifilamentary Nb46.5Ti/Cu composites at high magnetic fields

X. H. Liu, L. Zhou, X. Z. Wu, N. Zhou, P. X. Zhang, Y. Feng

科研成果: 期刊稿件会议文章同行评审

3 引用 (Scopus)

摘要

A lower temperature pre-heat treatment process was used to study the effects of heat treatment on microstructure and critical current densities in Nb46.5Ti multifilamentary composites. The results show that pre-heat treatment at lower temperature (such as 375°C) is beneficial to refining α-Ti particles and sub-bands, furthermore dispersing α-Ti particles throughout NbTi matrix, and then, critical current densities have been obviously improved at higher magnetic fields. At 4.2 K, 5 T, critical current densities reached 3500 A/mm2, and at 4.2 K, 8 T, it reached 1740 A/mm2 for the first time. On the other hand, α-Ti particles are larger and not dispersed in Nb46.5Ti superconductors for pre-heat treated at higher temperature, and the Jc is lower, especially at low final strain. It is believed that refining the dispersed α-Ti precipitates and improving the amounts are the main reasons for improving critical current densities in Nb46.5Ti/Cu composites at higher magnetic fields.

源语言英语
页(从-至)217-220
页数4
期刊Physica C: Superconductivity and its Applications
337
1
DOI
出版状态已出版 - 1 7月 2000
已对外发布
活动IUMRS-ICAM'99: Symposium B of the 5th International Conference on Advanced Materials 'High-Tc Superconductors' - Beijing, China
期限: 13 6月 199918 6月 1999

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