不同轧制方式对退火电解铜箔组织及性能影响

Effects of different rolling methods on the microstructure and properties of annealed electrolytic copper foil

研究了冷轧和叠轧对退火电解铜箔的组织及性能影响。对不同退火状态铜箔分别进行冷轧和叠轧,表征了退火前后及轧制前后的显微组织演变。研究发现,电解铜箔经退火后,硬度降低,经冷轧和叠轧后,硬度提高,其中未退火铜箔经48%变形量叠轧后,硬度达最大值108 HV。铜箔退火后生成退火孪晶与退火织构,经轧制后演变为变形孪晶与变形织构。铜箔轧制过程中,内部塞积大量位错,出现大量以位错线、位错墙、位错缠结和位错胞为主的位错组织。综合来看,冷轧与叠轧对退火电解铜箔的组织与性能影响规律相似,但叠轧能获得更大变形量和更高力学性能,更能满足成品铜箔超薄且高强度的应用要求。

Effects of cold rolling and pack rolling on the microstructure and properties of annealed electrolytic copper foil were studied.Cold rolling and pack rolling were carried out in different annealed state copper foil,and the microstructure evolution before and after annealing and before and after rolling were characterized.It is found that the hardness of electrolytic copper foil decreases after annealing,and the hardness increases after cold rolling and pack rolling.The hardness of unannealed copper foil reaches a maximum of 108 HV after pack rolling with 48%deformation.After annealing,annealed twins and annealed textures are generated,which convert to deformed twins and deformed textures after rolling.During the rolling process of copper foil,a large number of dislocations accumulate inside,and a large number of dislocation tissues,mainly consisting of dislocation lines,dislocation walls,dislocation tangles and dislocation cells.On the whole,the influence of cold rolling and pack rolling on the microstructure and properties of annealed electrolytic copper foil is similar,but pack rolling can obtain greater deformation and higher mechanical properties,which can better meet the application requirements of ultra-thin and high-strength copper foil.