采用光学显微镜、扫描电镜和铝箔拉伸试验机,研究了Fe含量对未经均匀化处理的连续铸轧AA8079合金铝箔退火后晶粒组织和拉伸性能的影响。结果表明,当Fe含量小于0．84wt%时,成品铝箔退火后晶粒组织粗大,平均晶粒尺寸约为1mm,且晶粒沿轧制方向拉长,同时铝箔表现出较低的强度和延伸率；当Fe含量达到1．18wt%时,成品铝箔退火后晶粒组织急剧细化,晶粒尺寸约为6μm,且为等轴状,此时铝箔具有强度和塑形的最佳匹配,抗拉强度达到122MPa,延伸率达到4．3%。 EBSD分析的结果表明,随着Fe含量的提高,15°以下低角度晶界的亚晶较多,与固溶Fe含量相关。%The paper studied the effects of Fe content on grain structure and tensile properties of annealed AA8079 aluminum foil without homogenization by twin-rol continuous casting using OM, SEM, and foil tensile testing machine. The results showed that when Fe content was below 0. 84wt%, grain structure of annealed foils was coarse with average grain size of 1mm, and the grains were elongated along the rol ing direction, resulting in lower strength and elongation of foils; When Fe content was up to 1. 18wt%, grain structure was refined significantly and equiaxed with average grain size of 6μm; and tensile properties exhibited optimal combination of strength and plasticity, with tensile strength of 122MPa and elongation of 4. 3%. EBSD analysis showed that the amount of subgrains with low angle grain boundaries of less than 15° increased with higher Fe content, which correlated with solid solution of Fe.
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