An investigation on the enhancement of the critical current densities in bronze-processed Nb/sub 3/Sn

Conference · Fri Jan 01 04:00:00 EST 1982 · Adv. Cryog. Eng.; (United States)

OSTI ID:6238572

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

This study addressed the problem of enhancing the critical current characteristic of a commercial bronze-processed multifilamentary strand of nb/sub 3/Sn by varying its heat treatment. The work proceeds from the premise that the critical current characteristic is controlled by the metallurgical state of the reacted layer, which is, in turn, fixed by the processing which the wire has undergone. The wire used here was manufactured by Airco; a list of its specifications is given. The experimental procedure is provided, and the results discussed include the relationship between aging temperature, microstructure, and J /SUB c/ s(H), and the development of an improved aging treatment. It is concluded that J /SUB c/ (H) is largely controlled by 3 metallurgical parameters: 1) the volume of the fine-grained central shell within the reacted A15 layer; 2) the A15 grain size within the fine-grained shell; and 3) the composition profile through the reacted layer. Plots and tables are provied.

• Research Organization: University of California, Berkeley, CA
• OSTI ID: 6238572
• Report Number(s): CONF-810835-
• Conference Information: Journal Name: Adv. Cryog. Eng.; (United States) Journal Volume: 28
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BRONZE
COMPOSITE MATERIALS
COPPER ALLOYS
COPPER BASE ALLOYS
CRITICAL CURRENT
CRYOGENICS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
HEAT TREATMENTS
MAGNETS
MATERIALS
METALLURGICAL EFFECTS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TIN ALLOYS