U.P.B. Sci. Bull., Series B, Vol. 70, Iss. 4, 2008 ISSN 1454-2331 DEFFECTS IN THE AA8006 ALUMINUM ALLOY SHEETS Oana BĂJENARU 1 , Petru MOLDOVAN 2 , Dionezie BOJIN 3 Aliajele de aluminiu AA8006 sunt din ce în ce mai mult utilizate pentru fabricarea tablelor şi a foliilor. Pentru a pune în evidenţă rolul Fe, Mn şi Si în procesele de solidificare şi laminare s-a studiat microstructura şi defectele de suprafaţă ale unor table produse din aliajul AA8006. Studiul s-a efectuat prin microscopie optică, microscopie electronică (SEM) şi EDS. The AA8006 aluminum alloys are more and more used for manufacturing sheets and foils. In order to put in evidence the role of iron, manganese and silicon in the solidification and rolling processes, the microstructure and surface defects of some AA8006 sheets was studied. The investigation was carried out by optical, scanning electron microscopy and energy dispersive X-ray spectroscopy. Keywords: microstructure, sheet, defects, Al alloys 1. Introduction The AA8000 (8001-8030) aluminum alloys are recently developed materials. In this serie of alloys the alloying elements are: Fe, Sn, Ce, Li, Cu, Si, Zn, Mg, Ni and Mn. The AA8006 alloy is more and more used for manufacturing sheets and foils. The chemical composition of this alloy is given in Table 1. Table 1 Chemical composition of AA8006 alloy Element wt.% Element wt.% Al 95.9 – 98.5 Mg 0.1 max. Mn 0.3 – 1.0 Cu 0.3 max. Fe 1.2 – 2.0 Zn 0.1 max. Si 0.4 max. Other 0.05 1 Ph.D. candidate, Faculty of Materials Science and Engineering, University POLITEHNICA of Bucharest, Romania 2 Prof., Faculty of Materials Science and Engineering, University POLITEHNICA of Bucharest, Romania, E-mail: moldovan_petru@webmail.pub.ro 3 Prof., Faculty of Materials Science and Engineering, University POLITEHNICA of Bucharest, Romania