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In the magnetic confinement type fusion reactor, we thought that the high critical current density ( Jc) performance Nb3Sn wire will become the first candidate material for the future fusion magnet system due to its established industrial mass production and its technical achievements. However, the degradation of transport Jc property due to the high mechanical and thermal strains on the practical Nb3Sn wire is a serious problem to apply for the future fusion magnet to be operated under higher electromagnetic force environment. We developed the new bronze processed Nb3Sn wire using the Zinc (Zn) solid solution high Sn content bronze (CuSnZn) alloy matrix for improvement of the mechanical strength by the solid solution strengthening. We also confirmed that the Zn promoted to diffuse between Nb and Sn elements, and that Zn homogeneously remained in the matrix after the diffusion reaction. In the Nb3Sn wires with various CuSnZn(Ti) alloy matrices, the nonCu Jc value was increased by the twostage heat treatment, and the maximum nonCu Jc values under the external magnetic fields of 15 T and 18 T at 4.2 K were obtained about 420 and 160 A/mm2. The degree of Jc enhancement due to the twostage heat treatment was estimated 30 higher compared with onestage heat treatment. Change in the microstructure and the nonCu Jc enhancement due to the twostage heat treatment on the Nb3Sn multifilamenatry wire with various CuSnZn alloy matrices were reported. [doi:10.2320/jinstmet.JC201607]

Bronze Processed Nb<sub>3</sub>Sn Multifilamentary Wires Using Various Cu-Sn-Zn Solid Solution Strengthened Bronze Alloy Matrices