Powder metallurgy processed Nb/sub 3/Sn employing extrusion and varying Nb content

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6388683

Pourrahimi, S; Foner, S; Schwartz, B B; Thieme, C L.H.

Extension of powder metallurgy (P/M) processing of Cu-Nb-Sn is described for small scale industrial uniaxial extrusion (R less than or equal to 10/sup 4/) and for small scale hydrostatic extrusions for areal reductions R = 2000. Successful 2.5 cm o.d. uniaxial P/M processed extrusions at 950 and 250 /SUP o/ F were obtained. Model cold hydrostatic extrusions of single tin core and multitin core wire are described. The effect of Nb content for Cu-x wt% Nb, where 36 less than or equal to x less than or equal to 60 was examined. Increased overall critical current densities, J /SUB c/ , were obtained with increased Nb content up to 50 wt% Nb. For proper comparisons, values of J /SUB cm/ (where the prestress is removed), are given for several compositions. Improvement in J /SUB c/ for T less than or equal to 4.2K is also presented. Incorporation of Ti in Nb/sub 3/Sn by means of Sn-Ti core processing results in further increases in J /SUB c/ . The low R and large initial powder sizes result in relatively thick Nb fibers which are not completely reacted. The present extrusion P/M processed wires demonstrate several practical approaches for development of high performance materials. Optimization should yield high values of J /SUB c/ at 20 tesla.

• Research Organization: Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts
• OSTI ID: 6388683
• Report Number(s): CONF-840937-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG 21:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CHEMICAL COMPOSITION
COPPER ALLOYS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
EXTRUSION
FABRICATION
MATERIALS WORKING
METALLURGY
NIOBIUM ALLOYS
OPTIMIZATION
PARTICLE SIZE
POWDER METALLURGY
QUANTITY RATIO
SIZE
SUPERCONDUCTING WIRES
TIN ALLOYS
WIRES