Superconductivity in amorphous+crystalline Ti-(Nb or V)-Si-B ductile alloys obtained by rapid quenching from the melt
Ductile superconductors with a duplex structure consisting of amorphous and bcc phases have been found in rapidly quenched alloys of the Ti/sub 70-x/Nb/sub 30/(Si-B)/sub x/ and Ti/sub 60hyphenx/V/sub 40/(Si-B)/sub x/ quaternary systems. Continuous ribbons of these alloys were produced in the form of about 1-mm width and 0.02-mm thickness using a modified single roller quenching apparatus. The silicon content in these duplex alloys was limited to the range between about 7 and 19 at. % and the boron content was in the range of about 0 to 9 at. %. The superconducting transition temperature T/sub c/ increased with decreasing metalloid content and/or with replacement of silicon by boron. The highest values obtained were 7.3 K for Ti/sub 57/Nb/sub 30/Si/sub 10/B/sub 3/ and 4.7 K for Ti/sub 45/V/sub 40/Si/sub 8/B/sub 7/, which are much higher than those of Ti-Nb and Ti-V base amorphous superconductors. The upper critical magnetic field H/sub c/2 and the critical current density J/sub c/ for the Ti/sub 55/Nb/sub 30/Si/sub 7/B/sub 8/ alloy were about 5.1 x 10/sup 6/ A/m at 4.2 K and of the order 3.5 x 10/sup 4/ A/cm/sup 2/ at zero applied field and 4.2 K. Although the superconducting properties of the duplex alloys are still insufficient for practical use, the information that the duplex structure produces a remarkable improvement in the superconducting properties without a detectable change or loss of ductility seems to be very important from the technological point of view.
- Research Organization:
- The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai 980, Japan
- OSTI ID:
- 6346576
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 52:7; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
AMORPHOUS STATE
BCC LATTICES
BORON ALLOYS
CRITICAL CURRENT
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
CURRENT DENSITY
CURRENTS
DATA
DIMENSIONS
DUCTILITY
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
MAGNETIC FIELDS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
QUENCHING
SEMIMETALS
SILICON ALLOYS
SUPERCONDUCTIVITY
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
THICKNESS
TITANIUM ALLOYS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VANADIUM ALLOYS