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对纯铜带材进行异步累积叠轧大塑性变形,并辅以再结晶退火处理,制备出了均匀的超细孪晶铜材。利用透射电镜对变形铜材再结晶退火中形成的超细孪晶进行了观察。结果表明,大变形异步累积叠轧铜材在190℃下退火,变形铜材内发生孪晶形核,退火达到30 min时,铜材内形成均匀的超细孪晶,大小为2～3μm;再结晶退火初期,电导率快速上升,随退火时间延长,电导率缓慢升高,最高达59 MS/m。
The as-cast superconducting twinned copper material was prepared by the asynchronously accumulative rolling of the pure copper strip with large plastic deformation and the recrystallization annealing treatment. Transmission electron microscopy (TEM) was used to observe the ultrafine twins formed during recrystallization annealing of deformed copper. The results show that the as - deposited as - deposited copper alloy is annealed at 190 ℃ and the twin nuclei are formed in the deformed copper. When annealing reaches 30 min, the uniform ultrafine twin is formed in the copper with the size of 2 ~ 3 μm. In the early stage of crystallization annealing, the conductivity increased rapidly, with the annealing time increasing, the conductivity increased slowly up to 59 MS / m.