Current characteristics and microstructure in a multifilamentary Nb-37Ti-22Ta superconductor

Author

Chernyi, Oleg V. ; Storozhilov, Gennadiy E. ; Ilicheva, Vera O. ; Starodubov, Yakov D. ; Lazareva, Marina B. ; Andrievskaya, Natalya F.

Author_Institution

Kharkov Inst. of Phys. & Technol., Ukraine

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3796

Lastpage

3799

Abstract

The 210-filamentary superconductor based on Nb-37Ti-22Ta, wt.% alloy was obtained by using the electric arc melting and deformation processing. During alloy drawing we used four isochronal intermediate heat treatments at the temperature 425°C. The total heat treatment duration was varied from 50 to 1000 hours. The true plastic strain value between heat treatments was 0.4 and after the final treatment was 3-5. The kinetics of phase transformation in the ternary alloy was investigated by the method of transmission electron microscopy. The J _c value increases with an increasing quantity of the precipitated alpha-phase in medium magnetic fields. The J_c (5 T, 4.2 K) value reaches 3000 A/mm² or more. In high fields, J _c(10.4 T, 2.05 K) for the given superconductor was equal to 1600 A/mm². The parameters responsible for the shape of pinning force curve are determined for different treatment conditions

Keywords

critical current density (superconductivity); crystal microstructure; drawing (mechanical); flux pinning; heat treatment; melt texturing; multifilamentary superconductors; niobium alloys; plastic deformation; precipitation; superconducting tapes; tantalum alloys; titanium alloys; transmission electron microscopy; type II superconductors; 10.4 T; 2.05 K; 210-filamentary superconductor; 4.2 K; 425 C; 5 T; 50 to 1000 h; J_c; NbTiTa; alloy drawing; current characteristics; deformation processing; electric arc melting; heat treatment duration; isochronal intermediate heat treatments; microstructure; multifilamentary Nb-Ti-Ta superconductor; phase transformation; pinning force curve; plastic strain; precipitated alpha-phase; ternary alloy; transmission electron microscopy; Capacitive sensors; Heat treatment; Kinetic theory; Magnetic fields; Microstructure; Multifilamentary superconductors; Plastics; Superconducting materials; Temperature; Transmission electron microscopy;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919891

Filename

919891