Actions for Layer growth and microstructure in Nb3Sn multifilamentary superconducting wire

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Layer growth and microstructure in Nb3Sn multifilamentary superconducting wire

Author
Tribula, D.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
Columnar Nb3Sn grains are present adjacent to the Nb interface for all initial Nb3Sn layer thicknesses. Stress relief mechanisms, operating to relieve stresses induced by the transformation of Nb to Nb3Sn, are predominantly responsible for the microstructure of the reacted layer. Both time dependent (diffusive) and time independent (non-diffusive) mechanisms operate. Thus the Nb3Sn formation rate affects the final microstructure. A fast formation rate results in an equiaxed morphology. The addition of Mg to the starting Cu-Sn in bronze-route multifilamentary conductors refines the final Nb3Sn microstructure effecting higher critical current densities, Wu et al. However, the grain refining effect, and concomitant increase in J/sub c/, is indiscernible when the N3Sn formation rate is such that a fine equiaxed morphology results. The addition of Ti to the starting Nb in bronze-route multifilamentary conductors raises the H/sub c2/ of the Nb3Sn and thus the critical current densities, with no accompanying impact on the microstructure. Accurate grain size and shape determination within the Nb3Sn layer is possible through SEM examination of fractured wire surfaces.
Report Numbers
DE86015201; LBL-21729
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC03-76SF00098
OSTI Identifier 5468784
Research organization: Lawrence Berkeley Lab., CA (USA). Center for Advanced Materials.
View MARC record | catkey: 47368548