Influence of tensile stresses on the superconducting temperature of multifilamentary Nb/sub 3/Sn composite conductors
The need for Nb/sub 3/Sn multifilament conductors in large magnet systems has generated interest in the mechanical and associated electrical properties of these composites. The superconducting compound (Nb/sub 3/Sn) in bronze processed conductors is subjected to a compressive strain originating from thermal contraction of the outer bronze matrix. Such compressive strains lower the compound's superconducting temperature, T/sub c/ and critical current density, J/sub c/, while removal of the compressive strains by etching off the bronze matrix restores T/sub c/ and J/sub c/. Recent investigations have suggested that tensile loading of these composite superconductors can increase T/sub c/. In this report a study is presented of T/sub c/ and its relationship to both internal prestrains and applied tensile loads at 4.2 K in these composite superconductors.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 7220916
- Report Number(s):
- BNL-23016; CONF-770801-15
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
360303 -- Composite Materials-- Mechanical Properties-- (-1987)
360304 -- Composite Materials-- Physical Properties-- (-1987)
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
BRONZE
COMPOSITE MATERIALS
COPPER ALLOYS
COPPER BASE ALLOYS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
PHYSICAL PROPERTIES
STRAINS
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTIVITY
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE