Development of multifilamentary superconductors containing Nb-40wt%Ti-28wt%Ta ternary alloys

Conference · Wed Jan 01 04:00:00 EST 1997 · Advances in Cryogenic Engineering

OSTI ID:482127

Liu, H; Gregory, E ^[1]; Faase, K J; Warnes, W H ^[2]

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1. IGC/Advanced Superconductors, Waterbury, CT (United States)
2. Oregon State Univ., Corvallis, OR (United States)

Multifilamentary superconducting materials containing ternary alloys have been manufactured and their properties studied at 4.2K and 1.8K. Two compositions, Nb-40wt.%Ti-18wt.%Ta and Nb-41 wt.%Ti-28wt.%Ta were selected as they appeared to offer the maximum enhancement of H{sub c2}`s over the binary alloys at both 4.2K and 2.0K, respectively. Superfluid helium is now being considered for an increasing number of large devices. Thus, the study of these highly ductile ternaries at 1.8K to 2K is very important. Three 50.8 mm diameter multifilamentary billets were made from two ternary alloys and the Nb-46.5wt.%Ti binary alloy which provided a base line for comparison purposes. Critical current densities, (J{sub c}`s) for all materials after different thermomechanical treatments were measured at 4.2K, 2.0K and 1.8K. The upper critical fields of three alloys at 4.2K and 2.0K were determined from the extrapolations of J{sub c}`s to zero, and termed H{sub c2}*. Volume fractions and sizes of {alpha}-Ti precipitates immediately after the heat treatments were examined. Critical temperatures, (T{sub c}`s) for all alloys were also measured. The results of the properties measured will be discussed in this paper.

• DOE Contract Number: FG02-94ER81785
• OSTI ID: 482127
• Report Number(s): CONF-950722--
• Conference Information: Journal Name: Advances in Cryogenic Engineering Journal Volume: 42B
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRITICAL CURRENT
FABRICATION
MICROSTRUCTURE
NIOBIUM ALLOYS
SUPERCONDUCTING WIRES
TANTALUM ALLOYS
TERNARY ALLOY SYSTEMS
TITANIUM ALLOYS
TRANSITION TEMPERATURE