Severe plastic deformation of bulk Nb for Nb3Sn superconductors Conference Paper

abstract

• Cast pure Nb with very large grains was processed by multipass equal channel angular extrusion (ECAE) to refine the microstructure. Extrusions were performed on 25 and 50 mm square cross section bars in a right angle die at room temperature following different extrusion routes to strains above nine. The hardness of Nb reaches a saturation level after eight extrusion passes where it is 20% above that of fully worked Cu. Recrystallization bands appear to be absent in material processed by a new multipass route (E) which imparts shear on three intersecting planes and gives high processing yields. Hardness and optical microscopy measurements on recrystallized specimens are similar for 25 and 50 mm square bars which indicates a favorable scale-up response. Comparisons to commercially processed Nb and a cost estimate indicate that ECAE may be a viable method for manufacturing fine-grained, homogenous Nb for Nb3Sn multifilamentary superconductor applications. 2005 IEEE.

authors

• Hartwig, Karl

published proceedings

• IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY

author list (cited authors)

• Mathaudhu, S. N., Blum, S., Barber, R. E., & Hartwig, K. T.

citation count

• 7

complete list of authors

• Mathaudhu, SN||Blum, S||Barber, RE||Hartwig, KT

publication date

• June 2005

publisher

• Institute of Electrical and Electronics Engineers (IEEE)  Publisher

published in

• IEEE Transactions on Applied Superconductivity  Journal

keywords

• Diffusion Barrier
• ECAE
• Nb3Sn
• Niobium
• Severe Plastic Deformation

Digital Object Identifier (DOI)

• 10.1109/TASC.2005.849044

start page

• 3438

end page

• 3441

volume

• 15

issue

• 2

URL

• http%3A%2F%2Fdx.doi.org%2F10.1109%2Ftasc.2005.849044