Multifilamentary wires based on ternary Nb- Ti- Ta alloys with 55 and 4620 filaments have been fabricated by several processing routes. Ternary alloys with 12.4 and 20.4 wt. % Ta were used having T_c 8.99 and 8.70 K. Critical currents of the wires have been measured at 5-13.5 T and at 4.2 and 2.2 K. Critical current densities of the wires with 60-40 μm filaments and 7-3.5 μm filaments, which were prepared under the identical conditions, were compared for both the compositions.
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