Abstract
The critical current density of powder metallurgy processed (PM) wires is determined in part by the extent of the A15 phase formation in the vicinity of the Nb/Al interface. A series of multilayered samples was made to simulate the reactions in the PM wires. Transmission electron microscopy was used to study the reactions between the multilayers. The results indicate that the reactions at the Nb/Al interface depend strongly on the niobium and aluminum layer thickness and distribution. No evidence of the metastable Nb(Al) solid solution formation was found. It is concluded that the Nb 2Al and the residual niobium present in the reacted PM wires can be avoided if the niobium and aluminum layers are sufficiently thin and uniformly distributed with the proper stoichiometry.
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