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Investigation of a Cu-20 mass’ Nb in situ Composite, Part II: Electromagnetic Properties and Application

Fiber or ribbon reinforced in situ metal matrix composites (MMCs) consisting of Cu and 20 mass% Nb were produced by large strain wire drawing and cold rolling of a cast ingot. The microstructure of the composites was studied by use of scanning and transmission electron microscopy. The normal and superconducting properties of the wires and sheets in the presence of externally imposed magnetic fields were investigated and compared with the electromagnetic properties of pure Cu and Nb. The observations are discussed in terms of the microstructural changes during wire drawing and rolling. The current results substantiate that the amount of internal phase boundaries and the filament spacing have considerable influence on the normal and superconducting properties of Cu-20 mass% Nb. On the basis of the current findings potential industrial applications are discussed.