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Foi realizado um estudo comparativo entre três alumínios de pureza comercial com diferentes níveis de pureza - AA1100 (99,00%), AA1050 (99,50%) e AA1070 (99,70%), produzidos em escala industrial pelo processo semicontínuo ou Direct Chill (DC) - e o alumínio superpuro, AA1199 (99,995%), produzido em laboratório. Foram utilizadas várias técnicas de análise microestrutural: microscopia óptica convencional, microscopia eletrônica de varredura, microscopia óptica com luz polarizada, medidas de condutividade elétrica e dureza Vickers. Os três alumínios de pureza comercial apresentaram encruamentos crescentes e condutividade elétrica decrescentes com o aumento da quantidade de impurezas. A comparative study was carried out among three commercial purity aluminums with different levels of purity: AA1100 (99.00%), AA1050 (99.50%) and AA1070 (99.70%), produced on an industrial scale by Direct Chill (DC) process, and super pure aluminum, AA1199 (99.995%) produced in the laboratory. Several techniques of microstructural analysis were used: conventional optical microscopy, scanning electron microscopy, optical microscopy with polarized light, measurements of electrical conductivity and Vickers hardness. The three commercial purity aluminums showed an increase in work hardening and a decrease in electrical conductivity as the impurity content increased

Caracterização microestrutural dos alumínios comerciais AA1100, AA1050 e AA1070 e do alumínio superpuro AA1199