Abstract
The use of aluminium alloy sheets in cars allows improving fuel economy and reducing emissions. Sheet manufacturing based on twin-roll casting (TRC) is a cost effective technology that is a promising candidate for replacing the actual direct-chill casting technology. The effect of Mn content and pre-treatment on the grain structure and texture of recrystallized sheets produced from TRC AlMg3 alloys was investigated. Grain size and uniformity are affected mostly by the degree of deformation prior to annealing. The effect of Mn supersaturation and precipitation concurrent with recrystallization on grain size is less pronounced but both significantly reduce texture strength, especially this of the cube component. The mechanisms of the effect of Mn on texture were elucidated. High Mn solute supersaturation ensures suppression of cube texture development and prevents sheet anisotropy in forming procedures.

Key words
aluminium-magnesium alloys, manganese, twin-roll casting, grains, texture

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