Abstract
Aluminium and its alloys belong to the most widely used metallic materials for industrial applications. One of the possible casting methods is twin-roll casting which produces sheets with high solid solution supersaturation. Decomposition of this supersaturated material during heat treatment was studied in aluminium alloys from the AW-3003 series – one standard grade and the other modified by addition of zirconium. Characterization by differential thermal analysis and observations by electron microscopy revealed that precipitation of –AlMnFeSi phase occurred in two steps around 360 and 450 °C in twin-roll cast sheets, firstly on subgrain boundaries and afterwards also within the grains. In cold-rolled sheets, precipitates formed directly within the grains. The zirconium addition shifts recrystallization to higher annealing temperatures in the cold-rolled Zr-containing alloy. –AlMnFeSi
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