单晶铜线在强冷变形过程中的组织性能转变

Microstructure and Properties of Single Crystal Copper Wire during Strong Cold Deformation Process

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。

Microstructure and properties of single crystal copper wire in the condition of strong cold deformation were investigated to understand effects of strong cold deformation on microstructure and properties of single crystal copper wire and its formation mechanism.The results show that similar multi-crystal structure in strong cold deformed single crystal copper wire can be observed,which is attributed to special structure resulting in the generation of sub-grain and micro-phase in later deformation.Electric conductivity is decreased with increasing in deformation rate,where decrement-rate exhibits S line tends,slow-fast-slow.High working hardening rate on OCC single crystal copper rod can be observed during early deformation process,and the working hardening rate is decreased with strong cold deformation process,meanwhile,elongation is slightly decreased,and increment-rate of strength is decreased to a stable value.With elongation less than 3%,single crystal copper wire still realize severe deformation effects.