Abstract
Direct chill cast ingots of 3003 aluminum alloy were homogenized in the two conditions and subsequently submitted to the single pass hot rolling, and the rolled plates were held at exit temperature. The precipitation by homogenization and the structural change during the holding were investigated by means of transmission electron microscopy. Homogenization at 450°C results in fine dispersion of small α-Al(Fe, Mn) Si precipitate particles, on the contrary two step homogenization of 600°C→450°C bring about coarse dispersion of relatively larger particles. In the case of the former homogenization, subgrains form neither during rolling nor during holding, because of strong pinning of dislocations by the particles. On the other hand, the subgrain structure is formed during rolling after the two step homogenization. Moreover, recrystallization nucleates in the PFZ around the intermetallic compounds, and proceeds to the inner cast cell region. The recrystallization progresses fast in the highly deformed plate. The induced strain and the coarsely dispersed particles are considered to influence the structural changes during the hot rolling after two step homogenization.
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