Strongly enhanced critical current density in Nb 47 wt. % Ti having a highly aligned microstructure

The transport critical current density increased from 2610 to 5200 A/mm2 at 5 T, 4.2 K, when a round monofilament Nb 47 wt. % Ti composite was rolled to an aspect ratio of 9.7 and was tested with the broad face of the tape parallel to the field. This value exceeds the previous maximum of 3700 A/mm2...

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Bibliographic Details
Published in:Applied physics letters 1991-06, Vol.58 (25), p.2984-2986
Main Authors: Cooley, L. D., Jablonski, P. D., Lee, P. J., Larbalestier, D. C.
Format: Article
Language:English
Subjects:
ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELEMENTS
MAGNETIC FLUX
MATERIALS SCIENCE
METALS
MICROSCOPY
MICROSTRUCTURE
NIOBIUM
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENTS 360104 > Metals & Alloys-- Physical Properties
TRANSMISSION ELECTRON MICROSCOPY
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Summary:The transport critical current density increased from 2610 to 5200 A/mm2 at 5 T, 4.2 K, when a round monofilament Nb 47 wt. % Ti composite was rolled to an aspect ratio of 9.7 and was tested with the broad face of the tape parallel to the field. This value exceeds the previous maximum of 3700 A/mm2 by about 50%. Transmission electron micrographs show that more than 90% of the α-Ti precipitates in the optimum-rolled filament are aligned within 10° of the broad face of the tape, whereas the precipitates had a random azimuthal orientation prior to rolling. The strong alignment caused the elementary pinning force to be greatly enhanced in the parallel-field orientation; however, in the orthogonal orientation the Jc fell to low values characteristic of conventional wires having no α-Ti flux pinning centers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.104689