High field Jc characteristics of in-situ processed V3Ga and CCE processed Nb3cAl wires

Critical current densities in in-situ processed V3Ga wires prepared by a CaO crucible melting and CCE (clad-chip extrusion) processed Nb3Al wires were studied up to 22 T in the hybrid magnet (HM-2) at HFLSM, Tohoku University. A Cu-20%V alloy was melted by using an induction furnace and a CaO crucible, and then wire drawn down to the final size of ∼0.3 mm diameter. Samples were heat treated (450-550 deg. C)x(2-6.5 days) for the reaction of V3Ga compound after a Ga plating on the wire surface. The sample heat treated at 550 deg. C for 2 days showed the best Jc values higher than 104 A/cm2 up to 16.2 T. It is expected that higher Jc values at higher field will be attained after the optimization of alloy composition, heat treatment condition and so on. The best sample of Nb3Al wire prepared by the newly developed CCE process showed Jc higher than 104 A/cm2 up to 18.8 T at 4.2 K. (author). 12 refs, 4 figs