Effects of rolling deformation processes on the properties of Ag-sheathed Sr1-xKxFe2As2 superconducting tapes

He Huang, Xianping Zhang, Chao Yao, Chiheng Dong, Qianjun Zhang, Yanwei Ma, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The powder-in-tube method is widely used in fabricating iron-based superconducting wires and tapes. To make tapes, a multi-pass rolling process is usually adopted. However, the multi-pass rolling process limits the efficiency of tapes. In this work, rolling deformation technique was studied systematically by fabricating Sr1-xKxFe2As2 superconducting tapes. The total rolling reduction ratio is about 80% and the difference of superconducting performance of tapes rolled by 2, 3, 5 and 7 passes has been investigated. The critical current density Jc, Vickers micro-hardness and microstructure of the superconducting core indicate that tapes after 2, 3, 5 and 7 rolling passes exhibit a similar trend. The width of the tapes and the area of superconducting cores increase with decreasing the number of rolling passes, but the transport Jc of tapes after different rolling passes seems to be the same, except for the tape rolled by 2 passes, whose transport Jc is lower than the other tapes. Concerning the geometry uniformity for the superconducting cores, the sausaging phenomenon was not observed from the photograph of longitudinal cross-section of all the samples. "Lobes" phenomenon on transverse cross-section can be suppressed through decreasing the rolling passes. Therefore, we can obtain uniform and high-performance Ag-sheathed iron-based superconducting tapes by cutting the number of rolling passes down to 3, which is more advantageous to the large-scale producing in the future.

Original languageEnglish
Pages (from-to)94-99
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume525-526
DOIs
Publication statusPublished - 2016 Jun 1

Keywords

  • Critical current density
  • Rolling deformation
  • Superconducting tapes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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