NDLI: Optimization studies for processing Nb/sub 3/Al by a rapid ohmic-heating and quenching method

Content Provider	IEEE Xplore Digital Library
Author	Buta, F. Sumption, M.D. Tomsic, M. Hascicek, Y. Collings, E.W.
Copyright Year	2002
Abstract	Rapid heating to different temperatures in the vicinity of 2000/spl deg/C followed by quenching to room temperature was used to prepare short samples of jelly-roll-type Nb/sub 3/Al superconductor. The as quenched material has either a bcc or A15 structure depending on the presence or absence of a specific endothermic reaction during the rapid heating, but after a secondary heat treatment at 800/spl deg/C an A15 structure is obtained for both cases. Significantly higher critical current densities at magnetic fields up to 18 T (4.2 K) are obtained for samples quenched as bcc, while the A15-quenched material is superior at higher fields due to a larger upper critical field. For the bcc-quenched samples the critical current density is optimized (16 T, 4.2 K) when they are quenched from temperatures just above or 400/spl deg/C higher than the temperature of the endothermic reaction, with a noticeable drop in the middle range. A 10 hour secondary heat treatment gives rise to better superconducting properties than a 3 hour heat treatment (both at 800/spl deg/C). Some of the observed dependencies are explained using SEM microstructure analysis.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3980
Ending Page	3983
Page Count	4
File Size	443351
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optimization methods Niobium Heat treatment Magnetic materials Superconducting materials Heating Critical current density Magnetic fields Temperature distribution Wire
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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