Annealing effects on the electrical and superconducting properties of a Cu-15vol%Nb composite conductor

Author

Sandim, Maria J R ; Shigue, Carlos Y. ; Ribeiro, Luis G. ; Filgueira, Marcello ; Sandim, Hugo R Z

Author_Institution

Dept. of Mater. Eng., Faculdade de Engenharia Quimica de Lorena, FAENQUIL, Lorena, Brazil

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1195

Lastpage

1198

Abstract

In this paper, annealing effects on the electrical and superconducting properties of a multifilamentary Cu-Nb composite were investigated. During annealing, noticeable changes in the microstructure take place, in special those related to recovery and recrystallization of copper and niobium followed by spheroidization and further coarsening of the Nb-filaments. Results show that spheroidization becomes significant only above 800°C and, even after annealing at severe conditions, e.g., 1050°C for 32 h, the continuity of the niobium-conducting path is partially preserved. The influence of these microstructural changes on the superconducting and normal properties of the multifilamentary Cu-15vol%Nb composite conductor is discussed.

Keywords

annealing; copper alloys; electrical conductivity; multifilamentary superconductors; niobium alloys; recovery; recrystallisation; spheroidizing; 800 to 1050 C; Cu-Nb; Cu-Nb multifilamentary composite conductor; annealing; coarsening; electrical properties; microstructure; recovery; recrystallization; spheroidization; superconducting properties; Annealing; Conductors; Copper; Magnetic field induced strain; Magnetic properties; Microstructure; Multifilamentary superconductors; Niobium; Superconducting magnets; Temperature dependence;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018615

Filename

1018615