退火过程中AA3003铝合金的析出行为

Precipitation behavior of AA3003 aluminium alloy during annealing

通过硬度、电阻检测以及光学显微镜、透射电镜观察,研究了AA3003铝合金在退火过程中的析出行为以及对合金显微组织的影响。结果表明低温阶段(<450℃),大的冷轧变形量将导致更多的析出;在高温阶段(>450℃)时的析出与冷轧变形量无关;在300℃退火时,析出发生在再结晶之前,导致晶粒粗大;而在500℃退火时,再结晶发生在析出之前,可获得细小的等轴晶。对于铝电解电容器用AA3003铝合金阴极箔的生产,宜采用500℃,30min中间退火制度,这样既可以保证大量弥散相的析出,又可以获得细晶组织,有利于提高阴极箔比的电容。

The precipitation behavior of AA3003 aluminum alloy during annealing as well as its effect on the microstructures of alloys was investigated by means of hardness, electrical resistivity measurements, optical microscopy and transmission electric microscopy. The results show that in the low temperature region(<450℃)higher cold reduction results in larger amount of precipitates. However, the precipitation at about 500℃ is independent on the cold deformation reduction. On annealing at 300℃, precipitation is prior to recrystallization, the grains become coarse. But on annealing at 500℃, recrystallization is prior to precipitation, and fine grains are obtained. As for the production of AA3003 aluminium foil for cathode of aluminium electrolytic capacitor, the intermediate annealing process of 500℃, 30min is suitable, because a large amount of precipitates occurs and fine grains are obtained, which is in favor of the increase of specific capacitance of the cathode foil.