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Acta Metall Sin  2006, Vol. 42 Issue (11): 1121-1124     DOI:
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Texture and Anisotropy of Jc of ex situ MgB2/Fe Mono—Filamentary Tapes
SUO Hongli; MA Hongxia; WANG Ying; LIU Min; ZHAO Yue; MA Lin; ZHOU Meiling
Key Laboratory of Advanced Functional Materials of Education Ministry; College of Materials Science and Engineering; Beijing University of Technology; Beijing 100022
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SUO Hongli; MA Hongxia; WANG Ying; LIU Min; ZHAO Yue; MA Lin; ZHOU Meiling. Texture and Anisotropy of Jc of ex situ MgB2/Fe Mono—Filamentary Tapes. Acta Metall Sin, 2006, 42(11): 1121-1124 .

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Abstract  In this paper, the critical current density of ex-situ MgB2/Fe sheathed mono- filamentary tapes has been measured at various magnetic fields and different temperatures. The texture and anisotropy of Jc in these tapes were presented in detail. The commercial MgB2 powder was ball-milled in order to obtain different starting powder grain sizes. It was found that the anisotropy of Jc is influenced significantly by the starting powder grain size. The crystallite size of the annealed MgB2 core is more pronounced for the sample with larger starting powder grain size . In order to understand the origin of Jc anisotropy, we have undertaken detailed X-ray refinements on the degree of texturing in the MgB2 filaments after mechanical removal of the Fe sheath. The degree of texturing of the filaments at the interface Fe/MgB2 and in the centre of the MgB2 filaments has been determined. A moderate texture has been found, being slightly better at the interface between Fe and MgB2 core. The correlation among the starting power size, texturing and the anisotropy of Jc was discussed.
Key words:  ex- situ MgB2/Fe tapes      X-ray refinements analysis           
Received:  23 January 2006     
ZTFLH:  TM26  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2006/V42/I11/1121

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