Improvement of Mechanical Properties by Internal Matrix Reinforcement in Bronze Processed Nb₃Sn wire

—Internal Matrix Reinforcement by Solid Solution Strengthening Mechanism—

Abstract

We approached the internal matrix reinforcements using the Cu-Sn-Zn and Cu-Sn-In ternary bronze alloy matrices. After Nb₃Sn phase synthesis, these ternary bronze alloy matrices were transformed into（Cu, Zn）or（Cu, In）solid solutions having much higher mechanical strength. J_c degradation due to the transverse compressive stress on the internal matrix reinforced Nb₃Sn multifilamentary wire was evaluated. No J_c degradation was observed at approximately 100 and 150 MPa, which values were much higher than the conventional bronze processed Nb₃Sn wire. We found that the internal matrix reinforcement was effective for suppressing J_c degradation due to transverse compressive stress.