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The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire
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Western Superconducting Technologies Co,LTD,Xi’an National Engineering Laboratory for Superconducting Materials,Xi’an

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    Abstract:

    In present paper, NbTi/Cu wire the low copper-to-superconductor ratio of 1.3 and filament number of 630 was prepared using high homogenous Nb47Ti alloy bar and oxygen-free copper firstly. New type of aging heat treatment (“405℃/3h + 405℃/3h + 420℃/20h + 420℃/40h + 420℃/80h”) was proposed. Comparing with the traditional heat treatment, this new type heat treatment can largely improve the critical current density of NbTi superconducting wire to 3208A/mm2, with an increment of 17.5%. Only when the pre-heat treatment times is equal to or more than 2 times, huge of nucleation can be formed and critical current density can be improved obviously. In addition, Critical current densities of wire under three pre-strain conditions (4.64, 5.35 and 6.25) all get the peak value when final strain is between 5.0~5.2.

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[GUO Qiang, ZHANG Ping-Xiang, FENG Yong, LIU Xiang-Hong, LI Jian-Feng, Yanm Kai-Juan. The Effect of New Heat Treatment on Microstructure and Critical Current Density of NbTi Superconducting wire[J]. Rare Metal Materials and Engineering,2019,48(12):4113~4118.]
DOI:10.12442/j. issn.1002-185X.20190255

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History
  • Received:March 27,2019
  • Revised:April 23,2019
  • Adopted:May 15,2019
  • Online: January 07,2020
  • Published: