Critical current behavior in bending and tensile stressed Nb/sub 3/Sn composites at temperatures below 4. 2 K

Conference · Tue Sep 01 04:00:00 EDT 1981 · IEEE Trans. Magn.; (United States)

OSTI ID:6433868

Seibt, E W; Turowski, P; Springer, E

Critical current measurements were obtained of bronze-diffused reacted Nb/sub 3/Sn multifilamentary conductors as a function of mechanical stress loads and applied transverse magnet fields up to 13 T for temperatures in the range between 4.2 K and 1.9 K. To simulate the winding handling of reacted Nb/sub 3/Sn wires for superconducting magnets, operated in normal or superfluid helium, the effects of room temperature bend strain on current carrying capacities of monolithic and flat cable conductors were investigated by controlled winding processes using mandrels with various diameters. The results show a field-dependent degradation in critical current with increasing bend strain for both conductor types. Only small precompression effect on critical current is observed. At higher strain, beginning at 0.4%, the critical current decreased rapidly. Optical and scanning electron microscopy were used to examine the samples before and after testing. Additional data on the mechanical properties (tensile stress-strain diagrams) of Nb/sub 3/Sn samples are presented, along with critical current versus uniaxial tensile stress measurements at 2.2 K and 4.2 K, respectively. 11 refs.

• Research Organization: Kernforschungszent Karlsruhe, Germany
• OSTI ID: 6433868
• Report Number(s): CONF-810340-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG-17:5
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
BENDING
COMPOSITE MATERIALS
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ELEMENTS
FLUIDS
GASES
HELIUM
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
OPTICAL MICROSCOPY
RARE GASES
SCANNING ELECTRON MICROSCOPY
STRESSES
SUPERCONDUCTING COMPOSITES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TIN ALLOYS
ULTRALOW TEMPERATURE