Microstructure related superconducting and mechanical properties of some Nb-Ti alloys with additions of Ta and Zr

Journal Article · Sun May 01 04:00:00 EDT 1983 · IEEE Trans. Magn.; (United States)

DOI:https://doi.org/10.1109/TMAG.1983.1062318· OSTI ID:5465063

Khan, H

Effect of the substitution of Ta and Zr in different metallurgical states on the microstructure, lattice structure, superconductivity as well as the mechanical properties like room temperature Vicker's hardness, tensile strength and ductility of bcc-..beta..Ti phase alloys: Nb 0.5 Ti 0.5, Nb 0.40 Ti 0.45 Ta 0.15nd Nb 0.40 Ti 0.45 Ta 0.075 Zr 0.075 is investigated. Optical, SEM and EDX investigations show the alloys to be of homogeneous bcc-..beta..Ti phase with no segregation of Ta or Zr at the grain boundaries upon annealing. The room temperature Vicker's hardness and tensile strength increase upon addition of Ta and Zr whereas the ductility decreases and these parameters also depend upon the metallurgical state of the samples. Among the ternary and quarternary alloys the highest values of Vicker's hardness: 261 kg/mm/sup 2/; tensile strength: 694 N/mm/sup 2/ and ductility: 11 are observed for the Nb 0.40 Ti 0.45 Ta 0.075 Zr 0.075 (1100/sup 0/C; 30 h). The T /SUB c/ value decreases upon addition of Ta and Zr and also depends on the metallurgical state. The highest T /SUB c/ and the slope, dH /SUB c2/ /dt/ T=Tc values are observed for the as cast cold rolled alloys: Nb 0.45 Ti 0.45 Ta 0.15 (T /SUB c/ = 9.02 K; 2.14 T/K); Nb 0.40 Ti 0.45 Ta 0.075 Zr 0.075 (T /SUB c/ = 8.88 K; 4.28 T/K). The critical magnetic field values of Ginzburg-Landau and Maki as well as the Maki parameter are determined which also depend strongly on the metallurgical state. The alloy of composition Nb 0.40 Ti 0.45 Ta 0.075 Zr 0.075 (as cast; cold rolled) shows the presence of highest spin-orbit scattering for the compensation of paramagnetic limitation.

• Research Organization: Forschungs Institut fur Edelmetalle and Metallchemie, D-7070 Schwabisch Gmund
• OSTI ID: 5465063
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 19:3; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
GINZBURG-LANDAU THEORY
MAGNETIC FIELDS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALLURGY
METALS
MICROSTRUCTURE
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TANTALUM
TENSILE PROPERTIES
TITANIUM ALLOYS
TRANSITION ELEMENTS
VICKERS HARDNESS
ZIRCONIUM