变形过程中铸轧铝合金中元素分布的演化行为

摘要

采用层状溶解法,利用等离子发射光谱研究不同轧制变形量对铸轧1235铝合金板材厚度方向上铁、硅元素分布的影响.研究结果表明:铸轧坯料中铁的偏析非常严重,硅在铸轧板中存在比较轻微的偏析.经较小的变形量(49.3％)变形后,铁、硅元素的偏析规律与铸轧坯料中基本相似,这些元素在板料中的流动符合层状流动规律;当变形量较大时(83.6％),合金元素在金属中的流动变得复杂.%The effect of deformation on the distribution of Fe and Si in the twin roller cast billet was evaluated using a layer by layer dissolution method.ICP-AES was used to measure the chemical compositions in the dissolved solution.The results show that severe macro-segregation of Fe and slight macro-segregation of Si are of presence in the twin roller cast 1235 aluminum billet.A slight deformation (49.3％) cannot change the distribution of Fe and Si in the rolled twin roller cast strip.However,the distribution of Fe and Si in the twin roller cast strip is dramatically changed when the billet is deformed with a strain higher than 83.6％.