In order to improve the strength and electrical conductivity of Cu-Ni-Si alloy, the columnar crystalline C70250 copper alloy strip suffer from two deep cryogenic rolling-aging treatments with large deformation, and the relationship between the cryogenic rolling-aging process and microscopic structure, mechanical, conductive properties is studied, and the precipitation behavior is analyzed. The research findings show that the columnar crystalline C70250 copper alloy produced by continuous directional solidification can be directly processed by two cryogenic rolling-aging treatment with large deformation, eliminating the traditional solution treatment process and obtaining a fibrous tissue structures containing high-density dislocations and multi-scale precipitates, the yield strength, tensile strength and electrical conductivity of the alloy reached 879 MPa, 923 MPa and 38.7 % IACS respectively, combination of strength and electrical conductivity is excellent. Two deep cryogenic rolling with large deformation can force the matrix to change to amorphous, favorable to atomic diffusion. Solute atoms are continuously transformed into Ni₂Si phase and Cu atoms are continuously expelled, forming large-sized pure Ni₂Si precipitated phase and small-sized NiSi cluster phase containing Cu atoms, which together impede dislocation movement and reinforce alloy. With the uniform precipitation of multi-scale nano-precipitation phases and reduction of grain boundary density, the electrical conductivity along the rolling direction is significantly reduced.

为提高Cu-Ni-Si合金的强度和导电性，对柱状晶C70250铜合金带材进行两次大变形深冷滚压时效处理，深冷滚压时效过程与显微组织的关系，机械，导电性能进行了研究，并分析了析出行为。研究结果表明，连续定向凝固法生产的柱状晶C70250铜合金可直接进行两次大变形深冷滚时效处理，省去传统的固溶处理工艺，获得含有高密度位错和多位错的纤维组织结构。 - 水垢沉淀物，屈服强度，合金的抗拉强度和导电率分别达到了879 MPa、923 MPa和38.7 % IACS，强度和导电性的结合非常好。二次大变形深冷轧制可迫使基体向非晶态转变，有利于原子扩散。溶质原子不断转化为Ni₂ Si相和Cu原子不断被排斥，形成大尺寸的纯Ni ₂ Si析出相和含有Cu原子的小尺寸NiSi簇相，它们共同阻碍位错运动，强化合金。随着多尺度纳米析出相的均匀析出和晶界密度的降低，沿轧制方向的电导率显着降低。