AVALIAÇÃO DA PRESENÇA DE SOLUTO EM FOLHAS DE ALUMÍNIO
EVALUATION OF THE PRESENCE OF SOLUTE IN ALUMINIUM FOIL
Leandro de Almeida, Gustavo Tressia
Resumo
Folhas de alumínio com espessura inferior a 200 µm são utilizadas em inúmeras aplicações, como na fabricação de diferentes produtos, embalagens descartáveis, aletas de radiadores e blisters que necessitam de boa resistência a corrosão aliada a resistência mecânica. O ferro presente nas ligas de alumínio da série 1xxx e 8xxx, forma nas ligas duas principais fases secundarias Al3 Fe e α-AlFeSi (dispersóides), alterando a cinética de recristalização, obtendo-se assim excelentes limites de resistência e alongamentos pós recozimento. O silício em conjunto com o ferro forma variações de fases como Ɵ-Al13Fe4 (monoclínica), Al6 Fe (ortorrômbica), Al12Fe3 Si e Al3 Fe, sendo controladas na solidificação possibilitando obter excelentes resultados de propriedades mecânicas. O manganês presente nas ligas da série 3xxx forma duas principais fases Al6 (Mn,Fe) e α-Al12(Fe,Mn)2 Si, porém, na existência do silício se transforma parcialmente em Al12(Fe, Mn)3 Si, sendo muitas propriedades fortemente dependentes do tipo e forma dessas partículas, sendo assim, a obtenção da microestrutura deve ser controlada na solidificação e processos seguintes
Palavras-chave
Abstract
Aluminum foils with a thickness of less than 200 µm are used in numerous applications, such as the manufacture of different products, disposable packaging, radiator fins and blisters. These applications require both good corrosion resistance and mechanical strength. Iron present in 1xxx and 8xxx aluminium alloys forms two main secondary phases: Al3 Fe and α-AlFeSi, the last one as dispersoids, altering the kinetics of recrystallization and therefore giving rise to excellent strength and elongations after annealing. Silicon and iron form phases such as Ɵ-Al13Fe4 (monoclinic), Al6 Fe (orthorhombic), Al12Fe3 Si and Al3 Fe, which are controlled during solidification to improve mechanical properties. Manganese present in 3xxx alloys may form two main phases Al6 (Mn, Fe) and α-Al12(Fe, Mn)2 Si, but Al12(Fe, Mn)3 Si may also be present when silicon is added so many properties are strongly dependent on both type and particles shapes, Thus, microstructure must be well controlled in the solidification and subsequent processes.
Keywords
References
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