Microstructural state of Nb/sub 3/Sn in a multifilamentary titanium doped bronze-process wire

Conference · Sat Sep 01 04:00:00 EDT 1984

OSTI ID:5756100

Johnson-Walls, P E; Tribula, D; Dietderich, D R; Hassenzahl, W V; Morris, Jr, J W

The addition of titanium to bronze-processed Nb/sub 3/Sn wires is known to increase the upper critical field and, thus, improve the high field performance. High resolution studies were done to determine the effect, if any, on the microstructure caused by Ti addition. This work used a Hitachi wire with a Nb filament diameter of 3.5 ..mu..m and a bronze to niobium ratio of 2.5. The bronze matrix had 7.5 at. % Sn and 0.4 at. % Ti. The microstructure of the Nb/sub 3/Sn layer was studied in TEM on axial and longitudinal wire sections and in SEM on fractured wire surfaces. The results were compared with a previous study on a similarly processed Ti-free wire. It was found that the Ti addition caused no qualitative change in the microstructure. This result is contrasted with previous work on the beneficial effect of Mg additions that have been shown to be predominantly microstructural.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5756100
• Report Number(s): LBL-18704; CONF-840937-30; ON: DE85010979
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CRITICAL FIELD
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FILAMENTS
LAYERS
MAGNETIC FIELDS
MICROSCOPY
MICROSTRUCTURE
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
SCANNING ELECTRON MICROSCOPY
SUPERCONDUCTING WIRES
TIN ALLOYS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
WIRES