Superconducting and mechanical properties of in situ formed multifilamentary Cu-Nb/sub 3/Sn composites

Journal Article · Thu Dec 01 00:00:00 EST 1977 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.323598· OSTI ID:5307437

Harbison, J P; Bevk, J

A systematic experimental study of the variations of superconducting transition temperature and critical-current density is reported for in situ formed multifilamentary Cu-Nb/sub 3/Sn composites containing 10 at.% Nb and 2--3 at.% Sn annealed at either 650 or 700 /sup 0/C. A particular emphasis was placed on the evaluation of uniformity, thermal stability, and mechanical strength. Critical-current density was measured as a function of transverse magnetic field and was found to increase in samples measured in a bent position. The overall critical-current performance is comparable to that of reinforced stabilized conventional composites. Large residual resistivity ratios are indicative of a clean high-conductivity matrix surrounding each individual filament, an important requirement for thermal stability. High resistance to plastic flow in these composites is attributed to strong filament-to-matrix bonding and small interfilament spacing. The ultimate tensile strength at 77 /sup 0/K reached a value of approx.100 ksi (690 MPa). The measured uniformity of both critical currents and mechanical properties is found to be consistent with microstructural observations. Finally, an overall comparison is made with conventional continuous-filament superconducting composites.

• Research Organization: Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
• OSTI ID: 5307437
• Journal Information: J. Appl. Phys.; (United States), Vol. 48:12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NIOBIUM BASE ALLOYS
SUPERCONDUCTIVITY
TENSILE PROPERTIES
TIN ALLOYS
ANNEALING
BENDING
COPPER
CRITICAL CURRENT
FILAMENTS
MICROSTRUCTURE
SUPERCONDUCTING COMPOSITES
TRANSITION TEMPERATURE
ALLOYS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
HEAT TREATMENTS
MECHANICAL PROPERTIES
METALS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
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