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Microstructure of Nb3 (AlSiB) superconducting tapes with extremely high critical current densities

Published online by Cambridge University Press:  31 January 2011

Mireille Treuil Clapp ,
Zhang Jian  and
Tariq Manzur
Mireille Treuil Clapp
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Amherst, Massachusetts 01003
Zhang Jian
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Amherst, Massachusetts 01003
Tariq Manzur
Affiliation:
Department of Metallurgy, University of Connecticut, Storrs, Connecticut 06268
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Abstract

Alloys of Nb73Al12Si14.5B0.5 were rapidly solidified into amorphous ribbons using the melt spinning technique. These were isothermally annealed at temperatures ranging from 660 to 780 °C. The A15 phase began to crystallize at 700 °C and small amounts of second phases appeared at the higher temperatures. Crystallization was dependent on quenching rate as well as annealing conditions. Below 750 °C nucleation was nonuniform and was enhanced by surfaces and quenched-in nuclei. Above 750 °C nucleation became more uniform and completely crystalline ribbons with equiaxed grains ∼30 nm in diameter were obtained. These ultra fine grained ribbons had extremely high superconducting critical current densities of 8 × 1010 A/m2 and 5 × 1010 A/m2 at magnetic fields of 0.5 and 15 tesla, respectively, at 4.2 K.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 3 , June 1989 , pp. 526 - 529
Copyright
Copyright © Materials Research Society 1989

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