Microstructure of Nb/sub 3/ (AlSiB) supercondcuting tapes with extremely high critical current densities
Journal Article
·
· J. Mat. Res.; (United States)
OSTI ID:5833892
Alloys of Nb/sub 73/Al/sub 12/Si/sub 14.5/B/sub 0.5/ were rapidly solidified into amorphous ribbons using the melt spinning technique. These were isothermally annealed at temperatures ranging from 660 to 780 /degree/C. The A15 phase began to crystalline at 700 /degree/C and small amounts of second phases appeared at the higher temperatures. Crystallization was dependent on quenching rate as well as annealing conditions. Below 750 /degree/C nucleation was nonuniform and was enhanced by surfaces and quenched-in nuclei. Above 750 /degree/C nucleation became more uniform and completely crystalline ribbons with equiaxed grains /similar to/30 nm in diameter were obtained. These ultra fine grained ribbons had extremely high superconducting critical current densities of 8/times/10/sup 10/ A/m/sup 2/ and 5/times/10/sup 10/ A/m/sup 2/ at magnetic fields of 0.5 and 15 tesla, respectively, at 4.2 K.
- Research Organization:
- Department of Mechanical Engineering, University of Massachusetts, Amherst, Massachusetts 01003 (US); Department of Metallurgy, University of Connecticut, Storrs, Connecticut 06268
- OSTI ID:
- 5833892
- Journal Information:
- J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 4:3; ISSN JMREE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
ALUMINIUM BORIDES
ALUMINIUM COMPOUNDS
ALUMINIUM SILICIDES
AMORPHOUS STATE
ANNEALING
BORIDES
BORON COMPOUNDS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FILMS
HEAT TREATMENTS
ISOTHERMAL PROCESSES
MICROSCOPY
MICROSTRUCTURE
NIOBIUM ALLOYS
OPTICAL MICROSCOPY
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SILICIDES
SILICON COMPOUNDS
SUPERCONDUCTING FILMS
ULTRALOW TEMPERATURE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
ALUMINIUM BORIDES
ALUMINIUM COMPOUNDS
ALUMINIUM SILICIDES
AMORPHOUS STATE
ANNEALING
BORIDES
BORON COMPOUNDS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FILMS
HEAT TREATMENTS
ISOTHERMAL PROCESSES
MICROSCOPY
MICROSTRUCTURE
NIOBIUM ALLOYS
OPTICAL MICROSCOPY
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SILICIDES
SILICON COMPOUNDS
SUPERCONDUCTING FILMS
ULTRALOW TEMPERATURE