Effect of Cu Addition Into $\hbox {TiGa}_{3}$ Compound on Superconducting Properties and Microstructure of

The decay time of induced radioactivity in V₃Ga is remarkably shorter than in Nb-based compounds, making the V₃Ga compound as one of the candidate and suitable superconducting magnet materials for the future nuclear fusion system. In order to improve the superconducting properties of V₃Ga multifilamentary wires, we investigated high Ga content TiGa₃ compound with various Cu addition as the Ga source material. The Cu additions into TiGa₃ compounds were 10, 30, and 50 wt.%, respectively. The volume fraction of V₃Ga phase was increased with increasing of Cu addition. We confirmed that Cu addition into TiGa₃ compound promoted the formation of the V₃Ga phase. The optimum Cu addition into TiGa₃ compound on superconducting properties was obtained to be 30 wt. %, and H_c2 value of the 30 wt.%Cu sample was estimated to be above 24 T. This value was 3 T higher than conventional “Bronzed route” processed V₃Ga wires.