CuSnTi合金是青铜法制备Nb3Sn超导线材的关键材料，常规铸造法制备的CuSnTi合金晶粒粗大，反偏析现象严重，无法满足制备Nb3Sn线材高伸长率的要求。本研究采用热-力协同强化的思路，通过调控电弧熔炼及热挤压工艺参数，使Cu-15Sn-0.3Ti合金发生再结晶行为，成功制备出组织为细小等轴晶，力学性能良好的高溶质Cu-15Sn-0.3Ti合金。结果表明，在热-力协同作用下，铸态Cu-15Sn-0.3Ti合金中粗大的树枝晶演化为细小的等轴晶，存在于枝晶间隙的富锡相发生回溶，合金组织转变为单一的α相；合金的极限抗拉强度达到387.2 MPa，伸长率达到42.5%，强度与伸长率超过了进口铜锡合金的性能指标。

A CuSnTi alloy is the key material for the preparation of Nb3Sn superconducting wires by the bronze method. Coarse grains and anti-segregation occurred in the Cu-15Sn-0.3Ti alloy prepared by conventional casting, which cannot meet the requirements of high elongation of Nb3Sn wires. In this work, the recrystallization of a Cu-15Sn-0.3Ti alloy was successfully induced by adjusting the process parameters of arc melting and hot extrusion composite processes, and a high-Sn content Cu-15Sn-0.3Ti alloy with fine equiaxed grains and good mechanical properties was prepared by using the idea of thermal-mechanical synergistic strengthening. The results show that under thermal-mechanical synergy, the coarse dendrites in the as-cast Cu-15Sn-0.3Ti alloy evolve into fine equiaxed crystals, the tin-rich phase in the dendrite gap dissolves, and the microstructure of the alloy transforms into a single α phase. The ultimate tensile strength of the alloy reaches 387.2 MPa, and the elongation reaches 42.5%, which exceeds the performance indices of imported CuSn alloys.