72559B03-I For Nb-based superconductor applications, prior work has indicated that if the starting Nb configuration (rod, plate, sheet, or tube) has large grain size, a nonuniform grain size, or significant texture gradients, then the resulting multi-filamentary conductors will have a lower… More

75778-Previous research has shown that the Ta diffusion barrier in composite Nb3Sn superconductors, such as those used in the superconducting magnets needed for fusion confinement systems, may develop a failure mode during wire drawing, due to the non-uniform deformation of the thin Ta layer. This… More

79394B Superconducting radio frequency (SRF) cavities, such as those fabricated at Jefferson Laboratory and used in charged particle linear accelerators, are formed by deep drawing. In this process, a non-uniform or poorly textured microstructure in the starting sheet can cause poor deformation… More

75778B Previous research has shown that the Ta diffusion barrier in composite Nb3Sn superconductors, such as those used in the superconducting magnets needed for fusion confinement systems, may develop a failure mode during wire drawing, due to the non-uniform deformation of the thin Ta layer. … More

Superconducting radio frequency (SRF) cavities, such as those fabricated at Jefferson Laboratory or the National Superconducting Cyclotron Laboratory and used in charged particle linear accelerators like CEBAF, are formed by deep drawing a high-residual-resistance-ratio (RRR), pure niobium sheet. … More

The commercial fabrication of fine-filament superconducting Nb3Sn wire has inherent problems stemming from large grains in the starting Nb material. Current severe plastic deformation (SPD) techniques can eliminate the problem by producing small grains in the large cross section Nb bars used for… More

For advanced magnets used in high energy physics research, commercially available NB3Sn superconductor wire needs to have smaller superconducting filament regions, while retaining a high critical current density (Jc). However, the currently available Nb bars used in such conductors have a large… More

The tantalum (Ta) diffusion barrier in advanced Nb3Sn superconductors often develops a failure mode during wire drawing. In this mode, the Nb and Ta layer deforms non-uniformly, leading to a rough interface with adjacent copper. The non-uniform deformation of these layers can lead to premature… More

Superconducting radio frequency (SRF) cavities used in charged particle linear accelerators, are currently fabricated by deep drawing and welding high RRR pure niobium sheet. The sheet typically has a non-uniform and poorly textured microstructure which leads to excessive thinning, unpredictable… More

Diffusion barriers used in Nb3Sn wire are currently fabricated by wrapping Ta sheet into a tube with signifigant overlap. The result of current practice is non-uniform deformation in the Ta sheet as it thins by wire drawing because of non-uniform grain size and texture. In addition, a signifigant… More

Diffusion barriers used in Nb3Sn wire are currently fabricated by wrapping Ta sheet into a tube with an overlap seam. The result of current practice is non- uniform deformation in the Ta sheet as it thins by wire drawing because of non-uniform grain size and texture. In addition, a significant… More

Superconducting radio frequency (SRF) cavities used in charged particle linear accelerators, are currently fabricated by expensive deep drawing, welding, and geometry adjustment methods. The RRR pure niobium sheet used typically has a non-uniform and poorly textured microstructure which leads to… More

There is a need for better lightweight metal alloys for Department of Defense transportation vehicles. Such material will have extremely high strength and toughness, and could be used for improved armor and other vehicular structural components. We propose to fabricate three advanced extremely high… More