Effects of annealing process on sagging resistance of cold-rolled three-layer Al alloy clad sheets  

退火工艺对冷轧三层复合铝箔抗下垂性能的影响（英文）

作　　者：赵媛媛[1] 章帧彦[1] 靳丽[1] 董杰[1] 

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心和金属基复合材料国家重点实验室,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第10期2542-2551,共10页中国有色金属学报（英文版）

基　　金：Project(U1360104)supported by the National Natural Science Foundation and Bao Steel of China;Project(A type,12QH1401200)supported by the Shanghai Rising-Star Program,China

摘　　要：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℃ for 1h. After annealing at 380℃, 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℃ or 550℃, 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.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。

关 键 词：aluminum alloy microstructure ANNEALING Si diffusion sagging resistance 

分 类 号：TG335.8[金属学及工艺—金属压力加工] TG156.2