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研究了强冷变形条件下单晶铜的组织性能变化,并探讨了强冷加工对单晶铜组织性能的影响规律及其机制。结果表明,由于单晶铜特殊的组织结构,其在强冷变形加工过程中,一些亚晶、微结构等在变形后期不断产生,呈现出类似多晶体的组织形貌;单晶铜线的电导率随变形量增加而不断降低,降低速率呈S型变化,先慢后快再慢;形变初期OCC单晶铜杆的加工硬化率高,进入强冷加工阶段时,加工硬化速率降低,伸长率呈小幅下降趋势,强度增幅下降,趋于持平;在伸长率低于3%的情况下单晶铜线仍能实现大变形量的变形。
The change of microstructure and properties of single crystal copper under severe cold deformation was studied. The influence of strong cold working on the microstructure and properties of single crystal copper was also discussed. The results show that due to the special structure of single crystal copper, some subgrains and microstructures continue to be produced in the late stage of deformation during the cold-forging process, presenting a polycrystalline morphology. The conductivity of single-crystal copper wire Rate decreases with the increase of deformation, the rate of decrease is S-shaped, slow down first and then slow; early deformation of OCC single crystal copper rod processing hardening rate is high, into the strong cold processing stage, the work hardening rate decreases, the elongation Showing a slight downward trend, the intensity increase decreased, tends to be flat; in the case of elongation less than 3% of the single crystal copper wire can still achieve large deformation deformation.