Nb/sub 3/Al formation in sputter-deposited Nb/Al multi-layer samples
The critical current density of powder metallurgy processed wires is determined in part by the extent of the A15 phase formation in the vicinity of the Nb/Al interface. A series of multi-layered samples was made to simulate the reactions in the P/M wires. Transmission electron microscopy was used to study the reactions between the multi-layers. Results indicate that the reactions at the Nb/Al interface depend strongly on the Nb and Al layer thickness and distribution. No evidence of the metastable NbAl solid solution formation was found. It is concluded that the Nb/sub 2/Al and the residual Nb present in the reacted P/M wires can be avoided if the Nb and Al layers are sufficiently thin and uniformly distributed with the proper stoichiometry. 10 refs., 7 figs., 2 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5894130
- Report Number(s):
- LBL-22836; CONF-870272-11; ON: DE88003192
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DEPOSITION
ELECTRIC CURRENTS
ELEMENTS
GRAIN ORIENTATION
HEAT TREATMENTS
KINETICS
LAYERS
METALLURGY
METALS
MICROSTRUCTURE
NIOBIUM
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
ORIENTATION
PHASE TRANSFORMATIONS
POWDER METALLURGY
REACTION KINETICS
SPUTTERING
SUPERCONDUCTING WIRES
SYNTHESIS
TRANSITION ELEMENTS
WIRES