中间退火及成品退火速率对高压阳极铝箔微观组织的影响

摘要

采用不同中间退火温度及成品退火速率对高压阳极铝箔进行处理,并利用EBSD及XRD技术分析其微观组织结构,尤其是织构的变化规律.结果表明,中间退火温度对后续成品退火中形成立方织构起到了关键作用,这可能是由于低温中间退火保留了大量的形变储能,为成品退火时立方织构的形成增加了形核核心.同时,低的中间退火温度造成立方织构较理想位置偏转程度更大.随着成品退火加热速率的增大,铝箔再结晶分数及再结晶晶粒尺寸逐渐减小,这是由于退火加热速率的增大(低于临界加热速率),缩短了晶界迁移的时间,减缓了再结晶的发生.%The effect of the inter-annealing temperature and heating rate of final annealing on the microstructure of high-vol-tage anode aluminum foils was investigated by electron back scattered diffraction (EBSD)and X-ray diffraction (XRD).The results demonstrated that the inter-annealing temperature played a key role on the formation of cube texture in the final products,because the low inter-annealing retained lots of deformation stored energy and provided great driving force for the nucleation.Simultaneously,the cube texture deflected dramatically from the idea position at a lower inter-annealing temperature.With the increase of annealing heating rate during final annealing,the fraction and grain size of recrystallization decreased gradually,because a higher annealing heating rate (below the critical heating rate)reduced the time available for grain boundary migration and retarded the recrystalliza-tion.