Abstract: The influence of annealing process on the cube texture formation in aluminum foil of high voltage anode electrolytic capacitor was investigated using the quantitative texture analysis, EBSD micro orientation analysis, as well as grain size measurement. It is shown that the two main processes of primary recrystallization and grain growth are carried out during the final annealing. The two processes are overlapped each other in certain extent, in which stronger cube texture can be formed if the primary recrystallization is completed properly at 300 ℃ and the cube grain grow further at 500 ℃. The annealing at 500 ℃ for very long time will induce an abnormal grain growth and reduce the cube texture component.
Influence of annealing process on cube texture formation in aluminum foil of high voltage anode electrolytic capacitor
Abstract：
The influence of annealing process on the cube texture formation in aluminum foil of high voltage anode electrolytic capacitor was investigated using the quantitative texture analysis, EBSD micro orientation analysis, as well as grain size measurement. It is shown that the two main processes of primary recrystallization and grain growth are carried out during the final annealing. The two processes are overlapped each other in certain extent, in which stronger cube texture can be formed if the primary recrystallization is completed properly at 300 ?℃ and the cube grain grow further at 500?℃. The annealing at 500?℃ for very long time will induce an abnormal grain growth and reduce the cube texture component.
Fig.1 Textures after pre-treatment ({111} pole figures) (a) —300 ℃ for 1 h; (b) —300 ℃ for more than 2 h
图2 冷轧箔500 ℃退火时的织构 ({111}极图)
Fig.2 Textures during annealing at 500 ℃ ({111} pole figures) with different heating time (a) —10 s; (b) —100 s; (c) —1 000 s
表2 经预处理在500 ℃不同时间退火后的立方织构体积量
Table 2 Volume fraction of cube texture during annealing at 500 ℃ with different heating times after the pre-treatment
Pre-treatment
Before annealing at 500℃
Volume fraction of cube texture/%
10 s
100 s
320 s
1 000 s
3 200 s
Cold-rolled
-
88.1
92.5
94.6
94.0
94.7
Annealed at 300 ℃ for 1 h
61.0
95.9
96.0
95.8
0.02
-
Annealed at 300 ℃ for more than 2 h
88.4
91.0
83.8
86.3
80.5
0.04
图3 300 ℃, 1 h预处理后500 ℃退火时的织构 ({111}极图) 和平均晶粒尺寸
Fig.3 Textures during annealing at 500 ℃ with different heating time after pre-treatment at 300 ℃ for 1 h ({111} pole figures) and corresponding average grain size (a) —10 s; (b) —100 s; (c) —1 000 s
Fig.4 Textures during annealing at 500 ℃ with different heating time afterpre-treatment at 300 ℃ for more than 2 h ({111} pole figures) (a) —10 s; (b) —100 s; (c) —1 000 s
图5 退火箔 (300 ℃, 1 h+500 ℃, 1 000 s) EBSD分析
Fig.5 EBSD analysis of annealed foil (300 ℃, 1 h+500 ℃, 1 000 s) (a) —Analysing and measuring result of EBSD; (b) —Orientation analysing result of Fig.5 (a)
