Investigation of flux pinning and critical current densities in type II superconductors. Technical report No. 3, 30 Jun 1974--30 Jan 1975

Technical Report · Tue Feb 18 00:00:00 EST 1975

OSTI ID:7290388

Ashkin, M; Santhanam, A T; Mathur, M P; Deis, D W; Moon, D M

The relation between flux-pinning and microstructure has been established for Nb--25 percent Zr superconducting wires, cold worked and annealed between 600 and 700/sup 0/C. This treatment produces a recovery of the dislocation structure and the development of a cell structure but does not produce any detectable beta Zr precipitation. Optimum pinning as measured by the flux-pinning force density maximum results from a fine cell structure with the greatest structural difference between wall and interior. There is some indication that stronger pinning result from a higher initial level of cold work. Techniques for preparation of thin foils from longitudinal and transverse sections of multifilament superconductors for transmission electron microscopy have been developed. Longitudinal sections are prepared by first grinding the wire into a thin ribbon followed by electropolishing. Transverse sections are obtained after increasing the diameter at the conductor by copper plating. Large areas suitable for microscopy have been produced in multifilament niobium conductors with filament diameter of only 7 micrometers.

• Research Organization: Westinghouse Research Labs., Pittsburgh, Pa. (USA)
• DOE Contract Number: N00014-73-C-0026
• OSTI ID: 7290388
• Report Number(s): AD/A-006743
• Resource Relation: Other Information: See also report dated 20 Jun 1974, AD--780903
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NIOBIUM BASE ALLOYS
MAGNETIC FLUX
MICROSTRUCTURE
SUPERCONDUCTING WIRES
FABRICATION
ZIRCONIUM ALLOYS
BINARY ALLOY SYSTEMS
COLD WORKING
DISLOCATIONS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
HEAT TREATMENTS
MAGNETIZATION
SURFACE FINISHING
TYPE-II SUPERCONDUCTORS
ALLOY SYSTEMS
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CURRENTS
LINE DEFECTS
MATERIALS WORKING
MICROSCOPY
NIOBIUM ALLOYS
SUPERCONDUCTORS
WIRES
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