铜钛合金作为一种高强高弹铜合金，具有优异的强度、导热性、高温稳定性和抗应力松弛性能，被认为是替 代铍青铜的理想材料。然而，钛和铜之间物性差异大，且钛在铜中的室温固溶度低，导致铜钛合金铸态组织偏析严重，存 在粗大富钛初生相，制约合金强度和导电性能的提升。 基于此，本研究提出超声辅助凝固方法制备铜钛合金，通过实验 研究了超声功率对铜钛合金微观组织的影响规律，发现超声处理能够显著改善组织偏析，细化晶粒尺寸和初生相尺寸， 减小富钛相等初生相含量。经相同形变热处理制度，超声辅助凝固铜钛合金抗拉强度由801.38MPa提升至851.0MPa， 导电率由15.31%IACS提升至15.68%IACS， 力学和导电性能的协同提升与超声作用下晶粒尺寸细化和初生相含量减 少直接相关。

As high-strength and high-elasticity copper alloys, copper-titanium alloys are characterized by excellent strength, thermal conductivity, high-temperature stability and stress relaxation resistance and are considered ideal materials for replacing beryllium bronze. However, the differences in the physical properties of titanium and copper are significant, and the solubility of Ti in Cu at room temperature is limited. The microstructure segregation of the copper-titanium alloy is severe, and many coarse primary phases are inevitable, which restricts the improvement in strength and electrical conductivity. In this study, ultrasonic-assisted solidification was used to prepare a copper-titanium alloy, and the influence of ultrasonic power on the microstructure of the copper-titanium alloy was systematically discussed. The microsegregation is improved, the grain size and primary phase size are significantly refined, and the content of the Ti-rich phase is reduced after ultrasonic treatment. Under the same thermomechanical treatment, the tensile strength of the copper-titanium alloy increases from 801.38 MPa to 851.0 MPa, and the electrical conductivity increases from 15.31%IACS to 15.68%IACS. The simultaneous improvement in the mechanical and electrical conductivity properties is directly related to the refinement of the grain size and the reduction in the content of the primary phase under ultrasonic treatment.