采用硬度测试、EBSD观察、EDS分析及下垂试验系统地研究了退火工艺对冷轧4343/3003/4343复合铝箔及3003芯材铝箔的硬度、显微组织、Si 扩散及抗下垂性能的影响。研究结果表明，随着退火温度的升高，复合铝箔及芯材铝箔的硬度降低，而两种铝箔均在380°C退火1 h后获得最佳的抗下垂性能。380°C退火后，复合铝箔的皮材组织为细小的等轴再结晶晶粒，芯材由沿RD方向的粗大再结晶晶粒组成，而皮材中少量Si向芯材扩散。在高温440°C或550°C退火后，复合铝箔的抗下垂性能迅速恶化。其中皮材中晶粒长大，导致皮材与芯材的界面变模糊；芯材中的再结晶晶粒细化；皮材中大量Si向芯材扩散。与高温退火后晶粒细化相比，皮材向芯材的Si扩散是影响复合铝箔抗下垂性能的主要原因。
The effectsof annealing process on the hardness, microstructure, Si diffusion, and the sagging resistance of cold-rolled 4343/3003/4343 Al alloy clad sheets and their 3003 Al alloy core sheets were experimentally investigated through hardness tests, EBSD observations, EDS analysis, and sagging test.The results showedthat with the increase of annealing temperature, the hardness of both clad sheet and core sheet decreased, while thesaggingresistancesof both clad and core sheets achieved maximum values after annealing at 380°C for 1h. After annealing at 380°C, the clad layer contained fine and equiaxedrecrystallized grains; the core layer was composed of fully recrystallized coarse grains elongated along the rolling direction. The Si diffusion from the clad layer to the core zone was limited. After annealing at a higher temperature of 440°C or 550°C, thesaggingresistance of clad sheets worsened precipitously. The grains in the clad layer grew up, obscuring the interface between the clad and core layer; the recrystallized grains in the core layer became finer. Significant amount of Si penetrated into the core layer through the accelerated diffusion. Compared with the microstructure refinement, Si diffusion is the main factor influencing thesaggingresistance.
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