Highly strengthened multifilamentary (Nb,Ti)/sub 3/Sn wires stabilized with CuNb composite

Multifilamentary (Nb,Ti)/sub 3/Sn superconducting wires with reinforcing stabilizer of CuNb composite, CuNb/(Nb,Ti)/sub 3/Sn, were developed. The outstanding point is that the 0.2% proof stress at 4.2 K in CuNb/(Nb,Ti)/sub 3/Sn was extremely improved to 320 MPa even after the heat treatment at 670/spl deg/C for 192 hours, which is 1.8 times higher than that in ordinary Cu/(Nb,Ti)/sub 3/Sn. The overall J/sub c/ value in CuNb/(Nb,Ti)/sub 3/Sn was obtained to be 110 A/mm/sup 2/ at 16 T and 4.2 K. These results show that the bronze processed multifilamentary (Nb,Ti)/sub 3/Sn superconducting wire with CuNb reinforcing stabilizer is actually employable for a high field superconducting magnet.<>