NDLI: Ductility enhancement in unreacted internal-Sn Nb/sub 3/Sn through low-temperature anneals

Content Provider	IEEE Xplore Digital Library
Author	Strum, M.J. Summers, L.T. Miller, J.R.
Copyright Year	1965
Abstract	It is shown that a lack of tensile ductility in as-drawn superconducting wires at room temperature can lead to damage during magnet fabrication steps such as cabling and coil winding. The tensile elongation of 0.42 mm internal-Sn Nb/sub 3/Sn conductor in the as-drawn unreacted condition is limited to less than 3% at room temperature. The tensile elongation is substantially enhanced through low-temperature annealing treatments at 200 degrees C, increasing to as high as 10% after 24 h at 200 degrees C. This effect is attributed to increased work hardening capacity from softening, which reduces yield strengths up to 50% while maintaining 90% of the tensile strength. Fracture surfaces of annealed wires reveal increased adhesion between the Sn cores and the surrounding Cu as well as an increase in ductile void coalescence as the failure mechanism within the Cu. Preliminary results on the prereaction strain sensitivity of reacted wire critical currents confirm the increased strain tolerance in annealed wires.<>
Sponsorship	IEEE Magnetics Society
Starting Page	2208
Ending Page	2211
Page Count	4
File Size	372921
File Format	PDF
ISSN	00189464
Volume Number	25
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium Annealing Temperature Tin Capacitive sensors Superconducting filaments and wires Superconducting magnets Fabrication Superconducting cables Superconducting coils
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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