Investigation on the enhancement of the critical current densities in bronze-process Nb/sub 3/Sn

Conference · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:5621023

Hong, M; Wu, I W; Morris, Jr, J W; Gilbert, W; Hassenzahl, W V; Taylor, C

The work reported here addressed the problem of improving the critical current characteristic of a comercial multifilamentary Nb/sub 3/Sn strand by varying its heat treatment. The work was done from the perspective that the critical current characteristic is controlled by the metallurgical state of the reacted layer, which is, in turn, fixed by the processing the wire has undergone. The research was carried out in parallel with metallographic studies which analyzed the microstructure and composition profile within the reacted Nb/sub 3/Sn layer as a function of heat treatment. The combined results of metallographic and processing research suggest that it is possible to engineer the microstructure of the reacted layer to improve J/sub c/(H). The specific product of the work is a tailored double-aging treatment which introduces a favorable combination of microstructure and composition in the reacted layer and causes a substantial improvement in the critical current characteristic of the strand.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5621023
• Report Number(s): LBL-13015; CONF-810835-38; ON: DE82003901
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FABRICATION
HEAT TREATMENTS
MICROSTRUCTURE
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TIN ALLOYS