Strain effects in Nb3Al multifilamentary conductors prepared by phase transformation from bcc supersaturated-solid solution

Takeuchi, T.; Iijima, Y.; Inoue, Kiyoshi; Wada, Hitoshi; Haken, Bennie ten; Kate, H. Ten; Fukuda, K.; Iwaki, G.; Sakai, S.; Moriai, H.

doi:10.1063/1.119447

Cited by 84 publications

(39 citation statements)

References 9 publications

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“…At ε ip,long = −1.5% and l mfp = 2.8 nm, N(E F ) is reduced by 8% in the case of Nb 3 Al, but 18% in the case of Nb 3 Sn, in comparison to ε ip,long = 0%. As the strain sensitivity of N(E F ) is the main determinant of strain sensitivity of the superconducting properties of Nb 3 Sn, this implies that the superconducting properties of Nb 3 Al are less strain sensitivity that Nb 3 Sn, which is consistent with experimental evidence by Takeuchi et al [204,205].…”

Section: Effect Of Sublattice Distortion On the Superconducting Propesupporting

confidence: 78%

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

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This work is the result of efforts by many people, both in a professional and a personal sense. During my time in Berkeley I had the opportunity to work with friendly and supportive people who were pushing back scientific boundaries, regarding the limits of superconducting high field technology. It is an odd but good experience to read papers from various authors detailing one scientific breakthrough or another, and then to meet them in person. Being a multi-cultural hub, Berkeley also allowed me to meet and become friends with people from all corners of this planet.Along the way, people have been instrumental in making this research happen. At LBNL, Jonathan Slack, Reuben Mendelsberg, and Andre Anders allowed me to use their lab for a rather extended period of time thus allowing for the fabrication of thin films, and have helped in various other ways along the years. The people at Ohio State University have helped by repeatedly performing heat capacity measurements on Nb 3 Sn bulk samples which were kindly supplied by Wilfried Goldacker of the Karlsruhe Institute of Technology. In particular I would like to thank Mike Susner of the Ohio State University, who came to the lab in the weekends just to make sure my samples would get measured. John Bonevich of the National Institute of Science and Technology was kind enough to perform characterization work on some of the Nb-Sn thin films we made, which included the STEM image on the cover. A lot of the experimental work was made possible with software and hardware designed at the University of Twente (such as VI by Bennie ten Haken), and I have gotten useful recommendations and assistance along the way, such as the advice on thin film fabrication from Frank Roesthuis. Professors Marcel ter Brake, Herman ten Kate, David Larbalestier, and Frances Hellman were kind enough to write letters of recommendation which contributed to getting the CSC student fellowship award. Vladimir Kresin of LBNL was kind enough to answer various questions related to the microscopic properties of Nb 3 Sn and comment on the description of microscopic theory in this thesis.Shane Cybart and Stephen Wu have assisted Edwin Dollekamp and myself in attempting to do some very fancy experiments. Edwin, from the University of Twente, took on a complicated research topic and I was impressed with how far he managed to get in that work, and Shane and Stephen invested time in the evenings and weekends to make it happen. Professor Orlandos previous investigations of Nb 3 Sn were an inspiration for some of the work described in this thesis, and he was kind enough to answer questions by email and over the phone. Derek Stewart of the Cornell NanoScale Science and Technology Facility helped me to get familiar with density functional theory calculations and computing clusters and made the suggestion of using Quantum Espresso ab-initio software. Robert Ryne and Steve Gourlay of LBNL helped me getting access to sizeable supercomputing resources at NERSC which were needed for this research.My friends and family st...

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Section: Effect Of Sublattice Distortion On the Superconducting Propesupporting

confidence: 78%

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

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“…It has been reported that when a RHQ treatment is applied to Nb and Al raw materials, a solid solution of NbAl y with a bcc structure is formed [6][7][8][9][10][11][12]. Upon further heat treatment, this undergoes an A15 phase transformation to form Nb 3 Al.…”

Section: Introductionmentioning

confidence: 97%

Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Jin

Nakamoto

Harjo

et al. 2012

Journal of Alloys and Compounds

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“…However the commercially available bronze-processed Nb superconductors no longer seem suitable for the needs, because the highest fields attainable are unlikely to exceed 21 to 22 T due to the limits of its upper critical field, , and critical current density, . Another favorable conductor is the so-called RHQT (rapidheated, quenched and transformed) Nb Al, in a point of view on both the good high-field characteristic and good strain tolerance [2]- [5]. Recent progress of achievement of piece-length in excess of 300 m provides an incentive to fabricate 1 GHz NMR magnets [4].…”

Section: Introductionmentioning

confidence: 99%

Superconducting Property of<tex>$hboxNb_3(hboxAl,hboxGe)$</tex>Conductors Prepared by Diffusion Process

Banno

Takeuchi

Kikuchi

et al. 2004

IEEE Trans. Appl. Supercond.

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Nb 3 (Al Ge) conductors were prepared with a diffusion reaction process at a temperature around 1400 C, from multifilamentary Nb/Al-25at%Ge precursors. Critical current densities of 300 A mm 2 at 21 T and 220 A mm 2 at 23 T at 4.2 K have been obtained after a diffusion reaction at 1400 C for 7 h followed by 10 h/800 C heat treatment. The c2 in excess of 28.5 T is about 2 T larger than that of the so-called RHQT Nb 3 Al. Large Al-Ge filament size in the precursors over a few microns might be acceptable to improve high-field c performance, significantly reducing fabrication difficulty of the Nb/Al-Ge precursors. Small matrix ratio of 0.8 and piece-length of 30 m was achievable in the precursor preparation at our laboratory workshop without intermediate annealing. In addition, the current capacity up to values higher than 300 A at 21 T, 4.2 K has been given by an enlarged cross-section sample.Index Terms-Diffusion process, high-field material, Nb 3 Al, Nb 3 (Al Ge).

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Strain effects in Nb3Al multifilamentary conductors prepared by phase transformation from bcc supersaturated-solid solution

Cited by 84 publications

References 9 publications

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Superconducting Property of<tex>$hboxNb_3(hboxAl,hboxGe)$</tex>Conductors Prepared by Diffusion Process

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Strain effects in Nb3Al multifilamentary conductors prepared by phase transformation from bcc supersaturated-solid solution

Cited by 84 publications

References 9 publications

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Superconducting Property of&lt;tex&gt;$hboxNb_3(hboxAl,hboxGe)$&lt;/tex&gt;Conductors Prepared by Diffusion Process

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Superconducting Property of<tex>$hboxNb_3(hboxAl,hboxGe)$</tex>Conductors Prepared by Diffusion Process