Microstructure, composition and critical current density of superconducting Nb3Sn wires

Flükiger, R.; Uglietti, D.; Senatore, Carmine; Buta, F.

doi:10.1016/j.cryogenics.2008.05.005

Cited by 107 publications

(105 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other possible reasons for the comparatively low of this strand include the absence of any alloying elements [12] and the Sn distribution within the A15 phase. Both, the microchemical strand homogeneity and the high average Sn content are important parameters that can strongly influence the critical temperature , the critical field and, as a result the critical current density [13].…”

Section: Discussionmentioning

confidence: 99%

Coarse ${\rm Nb}_{3}{\rm Sn}$ Grain Formation and Phase Evolution During the Reaction of a High Sn Content Internal Tin Strand

Scheuerlein

Michiel

Arnau

et al. 2011

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Coarse ${\rm Nb}_{3}{\rm Sn}$ Grain Formation and Phase Evolution During the Reaction of a High Sn Content Internal Tin Strand

Scheuerlein

Michiel

Arnau

et al. 2011

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

“…However, T c decreases along alloying and with much faster rate because of Ti than Ta. Many times both Ti and Ta are added together to achieve maximum benefit (Flükiger et al, 2008). It was noticed that addition of Ga at the cost of Sn increases J c , however, the growth rate of the product phase decreases (DewHughes, 1977, Horigami et al, 1976, Sekine et al, 1979, Sekine et al 1981.…”

Section: Effect Of Alloying Elementsmentioning

confidence: 99%

Microstructure, Diffusion and Growth Mechanism of Nb3Sn Superconductor by Bronze Technique

Paul¹,

Laurila²,

Vuorinen³

2010

Superconductor

View full text Add to dashboard Cite

“…The negative skew of the two distributions also reflects the shape of the vs. at.% Sn curve. As shown in [4], the variation of with Sn content is essentially linear up to 24at.% and levels off between 24 and 25at.%. In the doped samples the saturation of for Sn compositions close to the stoichiometry becomes less pronounced, resulting in the slightly enhanced with respect to the binary samples.…”

Section: A Bronze Route Wires: Effects Of Sn Composition and Ta Dopimentioning

confidence: 92%

Phase Formation, Composition and ${\rm T}_{\rm c}$ Distribution of Binary and Ta-Alloyed ${\rm Nb}_{3}{\rm Sn}$ Wires Produced by Various Techniques

Senatore

Mondonico

Buta

et al. 2012

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Low temperature calorimetry was used to determine the distribution of the superconducting transition temperature in binary and Ta-doped wires fabricated by the Bronze route and by the Powder-In-Tube (PIT) method. From this analysis we were able to discern the effects of Sn and Ta compositions on the distribution of the superconducting parameters and in the different samples. The influence of the heat treatment conditions on the superconducting properties was investigated for the PIT wires. In particular we determined the field dependence of the distribution for a commonly used reaction schedule (675 /84 h) and for an optimized heat treatment (625 /320 h). For the first time, we show that the wire reacted at 625 /320 h exhibits two separated contributions in the distribution directly related to the grain morphology of the A15 layer: a narrow peak determined by the large grains, with a lower , and a broad peak due to the fine grains, with a higher . The kinetics of the Sn diffusion in Nb and the growth rate of the A15 layer were experimentally studied. The influence of Ta doping on the A15 phase formation was analysed by electron microscopy, the growth rate and the grain morphology in binary and Ta-alloyed Bronze route wires with the same filament layout being compared at different stages of the heat treatment. At the end of reaction, the well known microstructure comprising equiaxed and columnar regions was observed in the filaments of both the binary and the Ta-alloyed wires. Based on these observations and from the growth rate analysis we conclude that Ta does not affect the Sn diffusion rate.

show abstract

Microstructure, composition and critical current density of superconducting Nb3Sn wires

Cited by 107 publications

References 73 publications

Coarse ${\rm Nb}_{3}{\rm Sn}$ Grain Formation and Phase Evolution During the Reaction of a High Sn Content Internal Tin Strand

Coarse ${\rm Nb}_{3}{\rm Sn}$ Grain Formation and Phase Evolution During the Reaction of a High Sn Content Internal Tin Strand

Microstructure, Diffusion and Growth Mechanism of Nb3Sn Superconductor by Bronze Technique

Phase Formation, Composition and ${\rm T}_{\rm c}$ Distribution of Binary and Ta-Alloyed ${\rm Nb}_{3}{\rm Sn}$ Wires Produced by Various Techniques

Contact Info

Product

Resources

About