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3-d
(red-blue anaglyph)fractograph of SMI-PIT Nb3Sn filament. A
chunk of filament has been pulled out allowing us to see both
the longitudinal as well and the transverse microstructure.
FESEM image. Unreacted strand supplied to the UW by Shapemetal Innovation
B. V., Enschede, The Netherlands.
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3d
(blue-green anaglyph) fractograph of VAC bronze process ITER
type Nb3Sn strand. These
filament have fractured along their longitudinal (wire drawing)
axis. Some have fracture across the center of the filament and
show columnar grains growing in the direction of the unreacted
Nb core. The initial (outer) Nb3Sn grains are equiaxed
and where the fracture has not crossed the inner region there
is the appearance of an entirely equiaxed layer.
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Sub-element
grouping of Nb3Sn filaments in bronze-process strand
now viewed in 3d (blue-green anaglyph) fractograph. FESEM.
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3d
(blue-green anaglyph) fractograph of filaments in a VAC bronze-processed
Nb3Sn strand. FESEM.
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3d
(blue-green anaglyph) fractograph across fully reacted layer
of TWC high critical current density MJR NbSn strand. The
core of the filament (the original source of the Sn prior to
reaction) is to the left. To the right there are some columnar
grains where the Sn has begun to react with the Nb diffusion
barrier. Outside the barrier is the Cu stabilizer matrix.Unreacted
strand supplied to the UW by (Teledyne) Wah Chang, Albany, OR. |
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3d
(blue-green anaglyph) fractograph of TWC high critical current
density MJR Nb3Sn strand. This image shows part of a sub-element (core at the bottom,
barrier at the top) that has been ramped up the final heat treatment
temperature but has not recieved the final heat treatment. Much
of the superconducting layer has been formed and the grains
are small and equiaxed (except for a larger grained inner layer).
The Nb3Sn grains fracture at their grain boundaries,
providing the contrast required to analyze their size and distribution.
The remaining unrected Nb is ductile and is pulled into the
mountain ridges by the fracture process. Unreacted strand
supplied to the UW by (Teledyne) Wah Chang, Albany, OR.
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3d
(blue-green anaglyph) fracture image of Sn breakout region of prototype Nb3Sn strand. This image shows a parially metlted region of a high-Jc filament pack. The rest of the sub-element can be seen in the inset image. This is a fracture image so the complex phase is hanging in the void space.after reaction (it would not otherwise survive the fracture process.
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3d (blue-green anaglyph) fracture image of Sn breakout region of prototype Nb3Sn strand. This is a poster-sized image showing a parially metlted region of a high-Jc filament pack (detail above). The image is a montage of images taken at different magnifications. Only the break-out area is at full resolution. |
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3d
(blue-green anaglyph) deep-deep-etch exposing Nb-Ti filaments in high performance strand. This image shows Nb-Ti filaments exposed by etching away the Cu stabiliser from a multifilamentary
Nb-Ti/Cu strand manufactured by IGC-AS. This strand is a high
Fe, high Jc prototype strand produced as part of the FNAL-UW
developmental work for the LHC-IR Quad superconducting accelerator
magnets. Strand supplied to the UW by IGC-AS under contract
with Fermilab.
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3d
(blue-green anaglyph) deep-etch cross section of Nb-Ti strand. This image shows a partial transverse cross-section of a multifilamentary
Nb-Ti/Cu strand manufactured by IGC-AS. This strand is a high
Fe, high Jc prototype strand produced as part of the FNAL-UW
developmental work for the LHC-IR Quad superconducting accelerator
magnets. Strand supplied to the UW by IGC-AS under contract
with Fermilab.
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