压延铜箔轧制压下率与组织织构和耐弯折性能的关系

Relations of Rolling Reduction and Microstructure, Texture and Bending Property of Rolled Copper Foils

采用退火态轧制铜带为原料,进行不同压下率的箔轧,研究箔轧压下率与铜箔组织织构及耐弯折性能的关系,并探讨其机理。结果表明,铜箔微观组织由沿轧制方向被拉长的扁平状晶粒组成,相邻晶界间距平均值随着箔轧压下率增大而显著减小;当箔轧压下率为90.7%时,铜箔相邻晶界间距平均值仅为0.52μm。铜箔轧制织构以铜型、S型和黄铜型织构为主。随着压下率的增大,轧制织构整体强度增大,取向不断集中。当箔轧压下率为90.7%时,铜箔的耐弯折性能最好,疲劳寿命可超过300次。大的箔轧压下率使得铜箔的晶粒尺寸更薄及取向更集中是铜箔耐弯折性能提高的根本原因。

Annealed pure copper strips were taken as raw materials, and after the processes of foil rolling, the rolled copper foils were fabricated. The effect of foil rolling reduction on microstructure, texture and bending property of the rolled copper foils was studied. The results show that the cross-sectional microstructure of the rolled copper foil consists of elongated grains and the adjacent grain boundaries spacing gradually decreases with the increase of the rolling reduction. When the reduction reaches 90.7%, the adjacent grain boundaries spacing is only 0.52 μm. Rolling textures of the rolled copper foils mainly consist of C, S and B orientation components. With the increase of reduction, the whole intensity of rolling texture increased, and the orientation concentrated continuously. The rolled copper foil with reduction of 90.7% has the best bending resistance, whose fatigue life is more than 300 times. The basic reason for the enhancement in bending performance of copper foils may be that a great foil rolling reduction makes their grains much thinner and their texture highly intensified.