抄録
The superconducting properties of Ti-Nb-Ta ternary alloys were investigated.
The upper critical field of Ti-Nb-Ta alloy is about 125kG, which is the highest of known alloy superconductors. Ti-Nb-Ta alloy with fixed Ta content to 5 at % maintains higher transition temperature, it being about 10°K. It has been found that the heat-treatment at 400°C for a long time is optimum for H-Ic characteristic of Ti-25Nb-5Ta alloy, and that this heat-treatment precipitates α-Ti in the matrix. This precipitate was sustained by transmission electron micrograph examination. The magnet wound with Ti-25Nb-5Ta wire produces 60kG without instability and with relatively small current degradation.
