大塑性变形冷压铝箔的室温回复行为

Room Temperature Recovery Behavior of Cold-Rolled Aluminum Foil Under Severe Plastic Deformation

摘要:

通过大轧制变形制备了含铜或锰的工业纯铝箔（低合金铝铁硅系），通过拉伸试验、光学显微镜、扫描电镜、电子背散射衍射和三维原子探针研究了室温停放或低温退火对铝箔力学性能和组织的影响。结果表明，室温停放后铝箔的抗拉伸强度和延伸率同时下降。亚晶合并等亚结构的回复机制导致了力学性能下降。含Mn合金因其亚晶尺寸的增加更为显著，延伸率下降更为明显。原子团簇强化可以部分补偿强度下降，而第二相的影响可忽略不计。

Abstract:

Pure aluminum foil (dilute Al-Fe-Si alloy series) with Cu or Mn addition was prepared by severe cold-rolling deformation, and the effect of room temperature storage or low temperature annealing on the tensile properties and microstructure was investigated through tensile tests, optical microscope, scanning electron microscope, electron back scatter diffraction, and atom probe microscope. Results show that the ultimate tensile strength and elongation simultaneously decrease after room temperature storage. The recovery mechanism of substructure, such as subgrain coalescence, leads to the decrease in tensile properties. The decrease in plasticity is more significant for the Mn-containing alloy due to the more significantly increased subgrain size. The atom cluster strengthening can compensate for the strength loss to some extent, whereas the effect of the secondary phases is negligible.