Paper Title:
Influence of Preparation Process on Microstructure, Critical Current Density and Tc of MgB2/Fe/Cu Wires
  Abstract

The powder-in-tube MgB2 wires were prepared by high energy milling of Mg and B powder. The powder was not mechanically alloyed for 2h short milling time. However, the MgB2 grains in wires were very small (20~100nm) and resemble the dimple after post-heat treatment. The clear evidence for transcrystlline fracture was observed. It indicated that the grain connection was greatly improved and the fluxing pinning was significantly enhanced. Another point to view was no intermediate annealing during the whole rolling process. The influence of the post-heat treatment on the transport current density was studied. Despite the lower Tc of about 35K, the transport current density reached to 3×104A/cm2 at 15K and 3.5T for wires sintered at 700°C.

  Info
Periodical
Materials Science Forum (Volumes 546-549)
Edited by
Yafang Han et al.
Pages
2031-2034
DOI
10.4028/www.scientific.net/MSF.546-549.2031
Citation
Y.F. Wu, G. Yan, J.S. Li, Y. Feng, S. K. Chen, H. P. Tang, H.L. Xu, C. S. Li, P. X. Zhang, Y. F. Lu, "Influence of Preparation Process on Microstructure, Critical Current Density and Tc of MgB2/Fe/Cu Wires", Materials Science Forum, Vols. 546-549, pp. 2031-2034, 2007
Online since
May 2007
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