HIGHLY-STRENGTHENED ALUMINA-COPPER ALLOY MATRIX (NB,TI)(3)SN CONDUCTOR FABRICATED BY USING THE TUBE PROCESS

In order to fabricate a large-bore, high-field magnet which achieves a low coil weight and volume, a high strength compound superconducting wire is required. The alumina-copper strengthened (Nb,Ti),Sn wire whic h contained 30 vol.% alumina-Cu alloy fabricated by using the tube pro cess has been developed and tested for critical current density, mecha nical properties, transverse compressive stress effects and related pr operties, As a result, it was found that the reinforced (Nb,Ti)(3)Sn w ire had high transverse compressive stress tolerance, for example only 3% decrease which was 1/3 of the Cu matrix wire in I-c/I-c0 at 60 MPa and reversibility in Ic between 0 and 200 MPa. Using the newly develo ped reinforced-(Nb/Ti)(3)Sn wire, it will be possible to fabricate a l ightweight, large-bore, high-field and compact superconducting magnet in the near future.