(Nb,Ti)3Sn Multifilamentary Wires with Cu-Nb Reinforcing Stabilizer
The mechanical and electrical properties of Cu-Nb composites were investigated from the standpoint of reinforcement and stabilizing materials for a Nb3Sn wire. After annealing at 943K for 240 hours, Cu-15, 20 and 30wt%Nb composites had the 0.2% proof stress of 228, 246 and 26OMPa at room temperature, respectively. A bronze processed multifilamentary (Nb,Ti)3Sn wire with Cu-Nb reinforcing stabilizer was newly developed. The 0.2% proof stress at 4.2K of the Cu-Nb/(Nb,Ti)3Sn wire was noticeably improved and the value of 314MPa was obtained after the heat-treatment of (Nb,Ti)3Sn formation at 943K for 200 hours. The strain effect of the critical current for Cu-Nb/(Nb,Ti)3Sn were measured at 14T and 4.2K. The strain dependence of Ic/Icm of the Cu-Nb/(Nb,Ti)3Sn wire was nearly the same profile as the conventional wire. It was verified that the Cu-Nb/(Nb,Ti)3Sn wire has the performance enough for both mechanical and superconducting properties under an enormous electromagnetic force in high magnetic fields such as 15T or more.
KeywordsCritical Current Proof Stress Intrinsic Strain Residual Resistance Ratio Areal Reduction
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