分级退火对高纯铝箔再结晶织构的影响

Effect of Multi-stage Annealing on Recrystallization Textures of High Purity Aluminum Foils

采用晶体取向分布函数 (ODF)、极图和TEM分析了高纯铝箔在不同的分级退火工艺过程中再结晶结构的演变。研究结果表明 :高纯铝的变形结构主要由S取向组成 ,另含有少量的Cu织构和BS 织构 ;2级退火箔材中立方织构含量高于 3级退火的 ;其中在 2 0 0℃低温退火时在亚晶界形成立方核心 ,并沿亚晶界析出含铁化合物 ,5 2 0℃高温退火后立方织构取向密度最大 ,R织构含量最少 ;在 2 5 0℃低温退火时 ,形成回复大角亚晶界 ,铁固溶在铝基体中 ,5 2 0℃高温退火后铁在晶内析出 ,立方织构减少 。

The effect of multi stage annealing on recrystallisation textures of high purity aluminum foils was investigated by means of transmission electron micrographs(TEM),pole figures and orientation distribution functions(ODF).The results showed that the deformation textures of high purity Al are mainly composed of S orientation and Cu textures.And the density of B S textures is lower.The cube texture after two stage annealing is higher than that of after triple stage annealing.During the low temperature stages of annealing at 200℃,the iron precipitates first along the sub grain boundaries,and the cube grains nucleate preferably within the sub grain boundaries.After the final annealing at 520℃,the recrystallization textures of the foils are almost entirely dominated by a very strong cube orientation.While the final annealing at 250℃ for 3 hours plus 520℃ for 2 hours,the strength of the cube texture component decreased and the R component increased.