Microstructural characterization of Nb sub 3 Al ultrafine multifilamentary superconducting wire by analytical electron microscopy

Journal Article · Mon Jul 22 04:00:00 EDT 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.105412· OSTI ID:5660835

Wadayama, Y; Suzuki, T; Aihara, K; Tada, N ^[1]; Kamata, K; Sakai, S ^[2]; Inoue, K ^[3]

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1. Hitachi Research Laboratory, Hitachi Ltd. 4026, Kuji-chou, Hitachi-shi, Ibaraki 319-12, Japan (JP)
2. Metal Research Laboratory, Hitachi Cable Ltd. 3550, Kidamari-cho, Tsuchiura-shi, Ibaraki 300, (Japan)
3. National Research Institute for Metals, 1-2-1, Sengen, Tsukuba-shi, Ibaraki 305, (Japan)

Microstructural characterization of the longitudinal cross section of Nb{sub 3}Al wires fabricated by an Nb tube composite process is presented. The wire was produced by cold reduction and a subsequent reaction between Nb matrix and Al-Mg core (final size: {similar to}{phi} 80 nm) at 950 {degree}C{times}5 min+750 {degree}C{times}72 h. The A15 superconducting compound (grain size: 100 nm) and unreacted fibrous Nb were observed in the microstructure. Nb{sub 2}Al or other phases rarely appeared. The average Al concentration at the A15 grain was 22--23 at. % from x-ray microanalysis. The critical current density {ital J}{sub {ital c}} of composite processed wire depended on the grain size of A15, with fine grains providing a high {ital J}{sub {ital c}} value.

• OSTI ID: 5660835
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 59:4; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
FABRICATION
MICROSCOPY
MICROSTRUCTURE
NIOBIUM ALLOYS
SUPERCONDUCTING WIRES
WIRES