Abstract
Bronze processed multifilamentary Nb3Sn superconducting wires with the reinforcing stabilizer CuNb in stead of the conventional Cu stabilizer were fabricated. The mechanical properties and the strain dependence of the critical current, Ic, were evaluated at 4.2K and a magnetic field of 15T. A remarkable increase in the yield stress of 70% and the plastic flow stress as compared with those in the wire with Cu stabilizer were observed. The strain for the peak Ic was also increased by 0.2%. Ic on unloading was reversible within the strain range of 1.5%. The strain sensitivity of Ic in the Cu-Nb/Nb3Sn wire was almost the same as that of the Cu/Nb3Sn wire. Decrease in the wire diameter from 0.8 to 0.5mm resulted in a slight increase in the flow stress of the CuNb/Nb3Sn wire, but no change in the strain dependence of Ic. The heat treatment temperature rise from 700 to 750°C resulted in a decrease in the yield stress of 15%, but no change in the strain dependence of Ic. Marked change in morphology of Nb filament in the CuNb reinforcing stabilizer during the heat treatment was evidenced.
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