Homogenization of twin-roll cast AA8079 aluminum alloy studied by in-situ TEM  

原位透射电镜研究双辊铸造AA8079铝合金的均匀化过程

作　　者：R.KRÁLÍK B.KŘIVSKÁ L.BAJTOŠOVÁ M.ŠLAPÁKOVÁ M.CIESLAR R.KRÁLÍK;B.KŘIVSKÁ;L.BAJTOŠOVÁ;M.ŠLAPÁKOVÁ;M.CIESLAR(Faculty of Mathematics and Physics,Charles University,Ke Karlovu 3,12116 Prague 2,Czechia)

机构地区：[1]Faculty of Mathematics and Physics,Charles University,Ke Karlovu 3,12116 Prague 2,Czechia

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第7期2138-2149,共12页中国有色金属学报（英文版）

基　　金：The financial supports of the Charles University Grant Agency Project(No.704119);Project TRIO FV(No.20337)of the Czech Ministry of Industry and Trade are highly acknowledged.

摘　　要：AA8079 is a commonly used stock material for manufacturing thin packaging foils.The primary alloying elements Fe and Si can form binary and tertiary intermetallics.In-situ TEM simulating homogenization annealing process of the as-cast material was used to analyze the real-time changes of the shape,type,and distribution of these particles.They affect the mechanical properties of the final product and susceptibility of the material to the formation of pinholes and other macroscopic defects.Another set of as-cast samples were annealed in a regime simulating industrial treatment in combination with measurements of resistivity to validate the results of the in-situ experiment.The results show clear temperature intervals of recovery,matrix desaturation,and phase transformations occurring in several stages:spheroidization of the original particles above 450℃,nucleation of new particles at 475℃,particles coarsening above 525℃,and an entire dissolution of the original particles above 550℃.AA8079铝合金是一种常用的制造薄包装箔的胚料,其主要的合金化元素Fe和Si可以形成二元和三元金属间化合物。采用原位透射电镜模拟铸态材料均匀化退火,分析这些颗粒的形状、类型和分布的实时变化,它们影响最终产品的力学性能、材料对形成气孔和其他宏观缺陷的敏感性。对另一组铸态样品在模拟工业热处理制度范围内进行退火处理,并结合电阻率测量,验证原位试验的结果。结果表明,在450℃以上的原始颗粒球化、475℃的新颗粒成核、525℃以上的颗粒粗化以及550℃以上的原始颗粒完全溶解等几个阶段发生了回复、基体去饱和以及相变,且具有明显的温度区间。

关 键 词：aluminum alloys in-situ annealing HOMOGENIZATION foil stock materials 

分 类 号：TG146.21[一般工业技术—材料科学与工程]