Page 96 - 机械工程材料2024年第十一期

张健宇，等：冷轧和退火对压延铜箔残余应力和力学性能的影响

Influence of Cold Rolling and Annealing on Residual Stress and
Mechanical Properties of Rolled Copper Foil

ZHANG Jianyu, WU Ting, LI Rongping, CHAI Shengli, LIU Wei

(Shanxi North Copper New Material Technology Co., Ltd., Yuncheng 044000, China)

Abstract: A 150 μm-thick copper foil base metal was rolled by reversible cold rolling for four passes. The rolled
copper foil with thickness of 35 μm was obtained, and was annealed at 180 °C for 1 h. The effects of cold rolling and
annealing on the microstructure, surface residual stress, and mechanical properties of the rolled copper foil was studied.
The results show that after cold rolling, the grain size of the copper foil was significantly refined, the average grain size was
reduced to 5.7 μm, and the texture changed from annealing texture to deformation texture. After annealing, the average
grain size increased to 9.4 μm and the texture was reverted to the annealing texture. After cold rolling, the surface residual
stress of the copper foil increased sharply to 543.02 MPa, the hardness increased, the average flexural fatigue life was
extended, the tensile strength along rolling direction (RD) was improved, and the elongation after fracture and the surface
roughness of TD (transverse direction) face decreased. After annealing, the surface residual stress of the copper foil was
recovered to 237.47 MPa, the hardness was reduced, the TD surface roughness slightly increased, the tensile strength
decreased and elongation after fracture were slighthy improved, and the average flexural fatigue life was further extended.
Key words: rolled copper foil; texture; residual stress; rolling; annealing

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