Development of in-situ-formed Nb/sub 3/Sn-Cu superconducting wire

Technical Report · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:5743238

Sue, J

Flux pinning and the optimization of J/sub c/ properties have been studied for in situ prepared Nb/sub 3/Sn-Cu superconducting composite wire. The pinning force density is found to be a universal function of magnetic fields as F/sub p/ porportional to h/sup 1/2/(1-h)/sup 2/ over the full range of reduced field density, h, from h = 0.1 to h = 1.0. The experimental results for a wide range of microstructures show that J/sub c/ is controlled by core pinning on surfaces of grain boundaries, and pinning by shear forces in flux line lattice at high fields is not important. The effective pinning area per unit volume calculated from theory is found to be equal to the area of the interfaces of Nb/sub 3/Sn-Nb/sub 3/Sn grain boundaries which are perpendicular to the filament axis. An attempt to increase J/sub c/ properties in these wires is made by eliminating C impurities, optimizing as-drawn Nb filament size and alloying with the third element Ta.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5743238
• Report Number(s): IS-T-973; ON: DE82005578
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
420201 -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
GRAIN BOUNDARIES
IMPURITIES
MAGNETIC FLUX
MICROSTRUCTURE
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
TIN ALLOYS
WIRES