Fine Grained Tantalum for Composite ${\rm Nb}_{3}{\rm Sn}$ Superconductor Diffusion Barrier Sheet

Mathaudhu, Suveen; Hartwig, K. T.; Barber, R. E.

doi:10.1109/tasc.2007.899413

Cited by 5 publications

(4 citation statements)

References 5 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported previously [1][2][3], an impediment to the efficient use of Ta as a diffusion barrier material in Nb 3 Sn superconductors is poor co-deformation behavior of commercial 325 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions.…”

Section: Introductionmentioning

confidence: 84%

See 1 more Smart Citation

INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES

Hartwig¹,

Balachandran²,

Mathaudhu³

et al. 2008

AIP Conference Proceedings

View full text Add to dashboard Cite

The objective of this work is to demonstrate a seamless tube fabrication method for obtaining uniform fine grained microstructures by a novel shear deformation process for tubular metal products. The manufacture of fine grained RRR Nb superconducting radio frequency (SRF) cavities, and other tubular Nb products requires strict microstructure control with respect to grain size and texture for good formability. The major challenges in SRF cavity fabrication and performance stems from: a) the high cost of pure Nb, b) a poor and inconsistent microstructure in the starting material, and c) seam welding to manufacture multi-cell cavities. The approach presented by the authors indicates a possible strategy to obtain fine grain Nb tube by an innovative shear process. Grain size less than 30μm and tensile ductility greater than 40 percent in the orthogonal direction are achieved. The tensile properties correlate with the strongest texture component in the processed tube. Based on preliminary results, the proposed methodology maybe a viable and cost effective approach to fabricating a seamless Nb tube with good hydroformability.

show abstract

Section: Introductionmentioning

confidence: 84%

“…The ECAE processed Ta billets were rolled into sheet following procedures reported previously [2]. Individual Ta sheets prepared by different processing schedules were incorporated into separate Cu-Ta composites Table 1 indicates the conditions of the sheets prior to assembly.…”

Section: Methodsmentioning

confidence: 99%

INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES

Hartwig¹,

Balachandran²,

Mathaudhu³

et al. 2008

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…It was found that the grain size was refined significantly due to the increase in hardness, but some coarse grains appeared with increasing the numbers of rotations. Mathaudhu et al produced a fine grained Ta via multi-pass equal channel angular extrusion (ECAE) process [ 17 ]. It was concluded that the refined nano-grains with the size of 100–400 nm was found to be beneficial for Nb 3 Sn superconductor.…”

Section: Introductionmentioning

confidence: 99%

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

2018

View full text Add to dashboard Cite

Microstructural evolution and wear performance of Tantalum (Ta) treated by ultrasonic nanocrystalline surface modification (UNSM) at 25 and 1000 °C were reported. The UNSM treatment modified a surface along with subsurface layer with a thickness in the range of 20 to 150 µm, which depends on the UNSM treatment temperature, via the surface severe plastic deformation (S2PD) method. The cross-sectional microstructure of the specimens was observed by electron backscattered diffraction (EBSD) in order to confirm the microstructural alteration in terms of effective depth and refined grain size. The surface hardness measurement results, including depth profile, revealed that the hardness of the UNSM-treated specimens at both temperatures was increased in comparison with those of the untreated ones. The increase in UNSM treatment temperature led to a further increase in hardness. Moreover, both the UNSM-treated specimens with an increased hardness resulted in a higher resistance to wear in comparison with those of the untreated ones under dry conditions. The increase in hardness and induced compressive residual stress that depend on the formation of severe plastically deformed layer with the refined nano-grains are responsible for the enhancement in wear resistance. The findings of this study may be implemented in response to various industries that are related to strength improvement and wear enhancement issues of Ta.

show abstract

“…The Nb and Nb7.5wt.%Ta has also been wrapped with a Ta barrier to reduce the tendency of the Sn to go into the Cu matrix but these sub-elements could not be made into restacks of more than 19-sub-elements. The low ductility of the Ta was believed to be the cause of the wire breakage and this approach requires a more ductile Ta such as that being developed by Shear Form Inc, (SFI), Bryan, TX, using Equal Channel Angular Extrusion (ECAE) [14].…”

mentioning

confidence: 99%

Final Report SBIR Phase I, Improvement of Properties of Tubular Internal-Tin Nb3Sn

Gregory¹

2009

View full text Add to dashboard Cite

Fine Grained Tantalum for Composite ${\rm Nb}_{3}{\rm Sn}$ Superconductor Diffusion Barrier Sheet

Cited by 5 publications

References 5 publications

INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES

INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES

Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy

Final Report SBIR Phase I, Improvement of Properties of Tubular Internal-Tin Nb3Sn

Contact Info

Product

Resources

About